You have been given 300mL of a 10% solution. The pharmacist asks you to dilute it with sterile water to 750mL and label the solution. What percent strength should appear on the label
Answers
4% should be the percentage of strength that appears on the label after dilution.
Calculating the final concentration of the solution will allow us to determine the percent strength that will appear on the label after dilution.
Given:
Initial volume of the solution = 300 mLInitial concentration (percent strength) = 10%Final volume of the solution = 750 mLLet's first determine the concentration of the solute (in this example, the amount of the active ingredient) in the original 10% solution:
solute volume = initial volume of solution x initial concentration (300 mL x 10% = 30 mL)
The amount of solute remains unchanged (since no solute has been introduced or taken away) after sterile water is added to the solution. However, the total volume of the solution is reduced to 750 mL.
We can use the following formula to determine the final concentration (percent strength) of the solution:
The final concentration is calculated as (total solute amount / total volume of solution) / 100.
Final concentration = (30 mL / 750 mL) × 100
= 0.04 × 100
= 4%
As a result, 4% should be the percentage of strength that appears on the label after dilution.
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Related Questions
what two major economic or global problems could be alleviated if we based our energy on hydrogen
Answers
The hydrogen can be produced from water using renewable energy sources, which makes it more sustainable.
If we based our energy on hydrogen, two major economic or global problems that could be alleviated are:
1. Climate change: This is a global issue that requires an immediate response. The world needs to move away from carbon-emitting fossil fuels. Burning hydrogen fuel emits only water and does not release greenhouse gases. If the world shifts to hydrogen fuel, it will reduce carbon emissions and help to slow down climate change.
2. Dependence on Oil: Most countries are dependent on oil. The price of oil is volatile, and the demand and supply fluctuate due to political, economic, and weather events. This dependence on oil is a major economic challenge for many countries. If we based our energy on hydrogen, we could reduce our dependence on oil and decrease oil imports, which could significantly improve the economy of countries that do not produce oil.
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Calculate the overall energy change for the complete combustion of one mole of methane in oxygen
Answers
The overall combustion energy for the reaction is -110 kJ/mol.
What is the enthalpy of reaction?The enthalpy of reaction, denoted as ΔH, is a measure of the heat energy exchanged or released during a chemical reaction at constant pressure. It represents the change in the internal energy of the system and is commonly referred to as the heat of reaction.
We know that the overall energy is given by;
[(2(805) + 2(464)] - [4(413) + 2(498)]
(1610 + 928) - (1652 + 996)
2538 - 2648
= -110 kJ/mol
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How much solute will remain undissolved when 180 g of potassium iodide is added in 100 cm3 of water at 30°C?
Answers
Answer:
\(m_{undissolved}=27g\)
Explanation:
Hello,
In this case, we first define the solubility as the maximum amount of a solute that is completely dissolved in an specific amount of solvent and it is temperature-dependent. Thus for potassium iodide, its solubility at 30°C is 153 g per 100 cm3 of water, therefore, with the given amount, the undissolved amount results:
\(m_{undissolved}=180g-153g=27g\)
Best regards.
How does the concentration of a gas in solution change when the partial pressure of the gas above the solution increases?
Answers
According to henry's law, higher the pressure of the gas, more is the solubility of gas in liquid. Increasing pressure on the gas molecules, reduces the kinetic energy of the gas molecules and hence increase the concentration of gas in solution.
What is henry's law of solubility?According to henry's law of solubility, the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid.
Mathematically,
C=K×P
where
C=solubility of a gas in a liquid
K= henry's constant=6.1x10⁻⁴ M /atm for nitrogen
P= pressure of the gas
The gas molecules keep on moving randomly with high kinetic energy so it is very difficult to dissolve gas in solution. To do this we need to apply high pressure over the gas so that gas particles comes closer and easily goes into the solution.
Therefore, increasing pressure on the gas molecules, reduces the kinetic energy of the gas molecules and hence increase the concentration of gas in solution.
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If you wanted to heat a substance without using a flame due to an abundance of flammable gas, you would use which of the following?
Answers
oxidation is a example of ?the answer choices are are here
A.a financial property,B.a chemical property,C.cool science stuff,D.a physical property
Answers
Answer:
B. a chemical property
Explanation:
Oxidation requires a chemical reaction to occur, therefore it is a chemical property.
Explanation: Oxidation is the chemical process in which a substance gains oxygen or loses electrons or hydrogen.
What piece of lab equipment could you use to measure the volume in a drinking glass of water?
graduated cylinder
volumetric flask
graduated beakerall of the above
Answers
All of the above-mentioned pieces of lab equipment can be used to measure the volume of water in a drinking glass.
However, each piece of equipment has its own advantages and limitations.
A graduated cylinder is a common piece of lab equipment used for accurate measurement of liquid volumes. It has markings along the side that allow for precise measurement of the volume of liquid in the cylinder.
A volumetric flask is a piece of lab equipment designed to measure and hold a precise volume of liquid. It has a narrow neck and a flat bottom, and is typically used for preparing solutions of a specific concentration.
A graduated beaker is similar to a graduated cylinder, but has a wider base and is less accurate for measuring small volumes of liquid.
All three pieces of equipment can be used to measure the volume of water in a drinking glass, but the choice of equipment will depend on the required accuracy and precision of the measurement. A graduated cylinder would be the most accurate choice, while a graduated beaker may be sufficient for less precise measurements.
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Convert 0.250 grams of water into the corresponding number of moles
Answers
Answer:
If 1 mole of water = 18 g
× =0.250g
Hence cross Multiply to get.
0.250×1/18=0.01389 moles
What happens to the particles of a gas when there are fewer of them?
Answers
Answer:
I think it just goes out into the air and the gas gets thinner (if it's not right sorry, this is just what I think happens)
When synthesizing fuming nitric acid from concentrated sulphuric acid and potassium nitrate, what steps can be made to reduce nitrogen dioxide?
Answers
When synthesizing fuming nitric acid from concentrated sulfuric acid and potassium nitrate, the steps that can be made to reduce nitrogen dioxide are:
carrying out the reaction under reduced pressure and temperatureperforming the reaction in the darkWhat is one method of preparing to fuming nitric acid?The formation of fuming nitric acid can be performed by the reaction of concentrated sulfuric acid and potassium nitrate.
The equation of the reaction is given below:
H₂SO₄ + 2 KNO₃ ---> 2 HNO₃ + K₂SO₄The formation of nitrogen dioxide occurs as a result of the decomposition of nitric acid.
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Gas is confined in a metal tank represented by the figure below. At 283.2K 283.2 K , the gas exerts a pressure of 7.571atm 7.571 a t m . After heating the tank, the pressure of the gas increases to 12.846atm 12.846 atm.
Answers
The gas in the tank has a final temperature of roughly 480.5 K.
Why is the gas under pressure?Gas molecules interacting with an object's surface generate force, which is what creates gas pressure. Although though there is very little force involved in each impact, any surface with a sizeable area is subject to many of them quickly, which can lead to a high pressure.
As per the ideal gas law,
PV = nRT
We can write: Provided that the volume and quantity of moles of gas remain constant.
P1/T1 = P2/T2
where the initial pressure and temperature are P1 and T1, and the ultimate pressure and temperature are P2 and T2.
With the values provided, we have:
P1 = 7.571 atm
T1 = 283.2 K
P2 = 12.846 atm
We can solve for T2:
T2 = (P2/P1) * T1
= (12.846 atm / 7.571 atm) * 283.2 K
= 480.5 K
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why is an atom regarded as electrically unstable
Answers
Answer: An atom can be considered unstable in one of two ways. If it picks up or loses an electron, it becomes electrically charged and highly reactive. Such electrically charged atoms are known as ions. Instability can also occur in the nucleus when the number of protons and neutrons is unbalanced.
Explanation:
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Describe the specific numbers measured and calculated. Restate the hypothesis and explain whether it was supported by
the data. Provide an example from the lab.
Answers
Answer:
To get from DNA, written in one chemical language, to protein, written in another, requires two major stages, transcription and translation.
Explanation:
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A sample of certain gas have Volume of 1.25 L ATM _125 degree Celsius and5.0 ATM the gas is compressed 50.0 ATM a volume of 325 mL. what is final temperature?
Answers
The final temperature of the gas is approximately 40.96 Kelvin.
To determine the final temperature of the gas, we can use the ideal gas law, which states:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature in Kelvin.
First, let's convert the given temperatures to Kelvin. We have:
Initial temperature: -125 degrees Celsius = 148 K (approximate)
Final temperature: Unknown
The initial conditions of the gas are as follows:
Initial pressure (P1) = 1.25 atm
Initial volume (V1) = 1250 mL = 1.25 L (since 1 L = 1000 mL)
Initial temperature (T1) = 148 K
The final conditions of the gas are as follows:
Final pressure (P2) = 50.0 atm
Final volume (V2) = 325 mL = 0.325 L
Final temperature (T2) = Unknown
Using the ideal gas law, we can set up the following equation:
(P1 * V1) / T1 = (P2 * V2) / T2
Substituting the known values:
(1.25 atm * 1.25 L) / 148 K = (50.0 atm * 0.325 L) / T2
Simplifying the equation:
T2 = (50.0 atm * 0.325 L * 148 K) / (1.25 atm * 1.25 L)
T2 = 40.96 K
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Calculate the wavelength (m) of light that has a frequency of 2.17 × 10^11 s-1
a) 1.38*10^-3
b) 6.51*10^19
c) 1.44*10^-22
d) 1.44*10^22
e) 1.38*10^3
f) none of the above
Answers
Answer:
e
Explanation:
wavelength = speed of light/frequency
wavelength = 3 x 10^8/2.17 x 10^11
wavelength = 1.38x10^-3m
Which condition must be met in order for an equation to be balanced? The elements in the reactants are the same as the elements in the products. There are fewer elements in the reactants than there are in the products. The number of atoms in the reactants is greater than the number of atoms in the products. The number of atoms in the reactants equals the number of atoms in the products.
Answers
Answer:
The number of atoms in the reactants equals the number of atoms in the products.
Explanation:
In every chemical reaction equation there are two sides; the reactants sides and the products side. The reactants side shows the species that combine to form the products. On both sides of the reaction equation, chemical species are found to be composed of atoms.
The major principle in balancing of chemical reaction equations is that the number of atoms of each element in the reactants side must be equal to the number of atoms of the same element on the products side. Once this condition is achieved, we can now say that the chemical equation is balanced.
Answer:
Answer D: The number of atoms in the reactants equals the number of atoms in the products.
Explanation:
Had the answer plus doing the quiz right now and got it right 100%
Sodium-24 has a half-life of 15 h. How many hours is three half-lives?
a. 60 h
b. 45 h
c. 30 h
d. 15 h
e. 7.5 h
Answers
So if we want three half lives we multiply 15 by 3
The number of hours in three half lives is 45
Answer:
(B)
Explanation:
If 1 half-life is 15 hrs, then 3 half-lives = 3×15 = 45
Therefore, there are 45 hrs in 3 half-lives (b)
100 POINTS, PLEASE I NEED THIS TO PASS MY CLASS NO TROLLS.
A chemical equation is shown below.
KNO3 → KNO2 + O2
What are the coefficients that should be added to balance this equation? Use complete sentences to explain your answer.
Explain how this chemical reaction demonstrates the conservation of mass.
Answers
Answer: only for the equation.
2KNO3->2KNO2+O2
Explanation:
The "standard" temperature and pressure of air at sea level are 20.0
∘
C and 1.00 atm, respectively. (a) Find the density, in kg/m
3
, of air at STP at sea level. Near the summit of Mount Everest, at an altitude of 26,000 feet, the density of air is only 40% the density at sea level and the temperature is −29.8
∘
C. (b) Find the pressure, in atm, of the air at 26,000 feet. (c) Find the partial pressure, in atm, of oxygen at 26,000 feet. Note: you can assume that air is 20% oxygen and 80% nitrogen, so that the molar mass of air is 28.8 g/mol, the weighted average of the molar masses of these two gases (i.e. 32 and 28 g/mol.)Mosthumansneedapartialpressureofatleast0.15 atm of oxygen to remain conscious, which is why most Everest climbers must breathe from oxygen tanks when near the summit. Enter your answer for Part c in the box below.
Answers
The answers are, density at STP at sea level = 1.29 kg/m3
pressure at 26,000 feet = 0.79 atm
partial pressure of oxygen at 26,000 feet = 0.87 atm
(a) The density of air at STP (Standard Temperature and Pressure), we can use the ideal gas law, which states that PV = nRT,
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
At STP, the pressure is 1.00 atm, and the temperature is 20.0 °C, which is 293.15 K. The molar mass of air is 28.8 g/mol.
we can rearrange it to solve for density (ρ = m/V) by substituting the values: density = (molar mass * pressure) / (R * temperature) = (28.8 g/mol * 1.00 atm) / (0.0821 L*atm/mol*K * 293.15 K).
Converting grams to kilograms and liters to cubic meters, the density of air at STP is approximately 1.29 kg/m³.
(b) The pressure at 26,000 feet altitude, we need to consider the decrease in air density.
The density of air at that altitude is only 40% of the density at sea level, the pressure will also decrease by the same factor. Therefore, the pressure at 26,000 feet is 40% of 1.00 atm, which is 0.79 atm.
(c) The partial pressure of oxygen at 26,000 feet, we calculate the partial pressure of oxygen based on its percentage in air.
Air is composed of 20% oxygen and 80% nitrogen, we can calculate the partial pressure of oxygen as follows: partial pressure of oxygen = total pressure * (percentage of oxygen / 100) = 0.40 atm * (20 / 100) = 0.87atm.
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Lithium nitrate has a molecular mass of 68.95 g/mol. What is the molarity of the solution that results from dissolving 31.8 g of lithium nitrate in 1.0 L of water?
Answers
The molarity of the solution that results from dissolving 31.8 g of lithium nitrate in 1.0 L of water is 0.461 M. To calculate the molarity of a solution, we use the formula: Molarity (M) = moles of solute ÷ liters of solution.
The steps to calculate the molarity of lithium nitrate are
Step one: we need to find the moles of lithium nitrate in the solution. We can do this by dividing the mass of the solute by its molecular mass: moles of lithium nitrate = \(\frac{31.8 g}{68.95 g/mol}\) = 0.461 molStep two, we need to find the liters of solution. In this case, we have 1.0 L of water.In the last step, we can plug these values into the formula to find the molarity: Molarity (M) = \(\frac{0,461 mol}{1.0 L}\) = 0.461 MLearn more about molarity: https://brainly.com/question/26873446
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(01.06 MC)
The gas carbon dioxide is a pure substance. Which of the following is true about carbon dioxide?
Group of answer choices
A:Carbon and oxygen are chemically bonded in it.
B:Carbon and oxygen retain their original identity in it.
C:It can be separated into carbon and oxygen using physical methods.
D:The proportion of carbon and oxygen is different in different samples of the gas.
Answers
Answer:
It can be chemically separated if it is a compound. The gas carbon dioxide is a pure substance.
Explanation:
Carbon dioxide is a pure substance because it has a fixed composition no matter where it was taken. Each molecule of carbon dioxide will always have 1 carbon and 2 oxygens.
In general, explain the difference between dietary fiber carbohydrates and sugar carbohydrates?
Answers
Answer:
Made up of glucose but passes through the body without being digested
Explanation:
Fiber: Made up of glucose but passes through the body without being digested. Sugar Alcohols: Not made up of glucose, therefore, they don’t directly affect blood glucose levels and are only partially digested. Although fiber is a carbohydrate, your body doesn’t digest it the same way.
Most thermal conductors are made of which material?
Answers
Answer:
copper
Explanation:
Answer:
metal
Explanation:
the amount of energy absorbed or released in the process of melting or freezing is the same per gram of substance.
Answers
"The amount of energy absorbed or released in the process of melting or freezing is the same per gram of substance" is true.
The amount of energy absorbed or released during the process of melting or freezing, known as the heat of fusion, is the same per gram of substance. This is a fundamental property of phase transitions. When a substance undergoes melting, it absorbs heat energy to break the intermolecular forces holding the particles together and transition from a solid to a liquid state. Conversely, during freezing, the substance releases the same amount of heat energy as it transitions from a liquid to a solid state, with the particles forming ordered arrangements and reestablishing intermolecular forces. Since the heat of fusion is a specific characteristic of a substance, it remains constant per gram of the substance, regardless of the quantity being melted or frozen.
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which of the following is not a fundamental particle? up quark electron down quark proton photon
Answers
Answer:
Explanation:
Fundamental particles are the subatomic particles with no substructure. i.e, those particles not composed of other particles
Quarks are fundamental particles because they cannot be separated into further sub particles. These have different 'flavours': up, down, top, bottom, strange, and charm. Other fundamental particles are electrons, and the other leptons: muons, tauons, muon neutrinos, electron neutrinos, and tauon neutrinos.
On the other side, we have the bosons. These are responsible for carrying the four fundamental forces: strong nuclear force, weak nuclear force, electromagnetic force, and gravity (The gravity force particle - graviton - is only theoretical, has not been discovered yet). The fundamental particles responsible for carrying these forces, are:
photon (electromagnetic force carrier), gluon (strong nuclear force carrier), Z/W⁺/W⁻ bosons ( weak nuclear force carrier), Graviton (gravitational force) [THEORETICAL ONLY], along with the Higgs Boson (mass particle) [DISCOVERED 2012}.
Therefore a proton is not a fundamental particle and neither are neutrons. These are composed of groups of 3 quarks. A proton is a group of (up, up, down) quarks, and a neutron is a group of (up, down, down) quarks. These are also known as baryons.
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The electron configurations of two unknown elements x and y are shown. X: 1s2 2s2 2p6 Y: 1s2 2s2 2p6 3s2 3p6 Which statement is most likely correct about the two elements? A) They will react because X can give up two electrons B) They will react because X and Y can share two pairs of electrons to become stable C) They will not react because both have a complete outermost shell and are stable D) They will not react because both will give up one electron. to become stable.
Answers
Answer:
B) They will react because X and Y can share two pairs of electrons to become stable
Explanation:
The electron configurations of two elements x and y are given :
X: 1s2 2s2 2p6
Y: 1s2 2s2 2p6 3s2 3p6
The statement that is true for both the elements is that, they both will react as they both can share two pairs of electrons to become stable.
To become stable the outermost shell or p orbital should have 8 electrons, so element X can gain 2 atoms to become stable.
Element Y can also react as it can also share two atoms to fulfill its 3p orbital and will stable.
Hence, the correct option is "B".
PLEASE HELP ME MY MOM COMES HOME SOON!! ITS 4AM!!
Blaire is teaching her little brother to ride his bike. She uses 7 N of force to push a 14 kg bike. What is the acceleration?
98 m/s2
0.5 m/s2
21 m/s2
2 m/s2
Answers
Answer:
The solution is
Explanation:
a = f/m
a =7/14
a=1/2
a=0.5
Acceleration of bike is 0.5 m/s²
Given that:Force used in push = 7 N
Mass of bike = 14 kg
Find:Acceleration of bike
Computation:Force = Mass × Acceleration
Force used in push = Mass of bike × Acceleration of bike
7 = 14 × Acceleration of bike
Acceleration of bike = 7 / 14
Acceleration of bike = 0.5 m/s²
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HELP ILL GIVE 100 POINTS
If you put a piece of zinc into a solution of copper (I) sulfate and allow the single replacement reaction to go to completion, how will you know which of the reactants is the limiting reactant? Write the balanced equation, including the states of matter of the reactants and products, to help support your answer.
Answers
what are 2 types of adaptation
Answers
Answer:
Physiological adaptations are how the animal's body functions on the inside. This includes changes in the cells, chemicals, and processes inside an animal's body. Behavioral adaptations are how an animal acts. This includes actions like hibernating and communicating.
Explanation:
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place the iron block on top of the heater and turn on the heat
where are the energy symbols going and what does this represent
the energy symbols are ______ and this represents ______
Answers
The energy symbols of heat relating to thermal energy are Q and this represents heat.
What is thermal energy?Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.
Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.
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