What is the density if 3.0 0ML has a mass of 3.85 G

Answer:

the answer is B- social contract

Explanation:

the person above me is correct

Let's do the operation:

0.00652 - 0.0003168 = 0.0062032

After the calculations, we choose as a reference the number with the fewest decimal places, it is 0.00652. So we need to round off the result to three significant figures.

So the answer is 0.00620.

Answer: 0.00620

The solution has a molarity of 0.0924 M.

The number of moles of solute per litre of solution is known as molarity.. For instance, water is both the solution and the solute when table salt is dissolved in it. Each mole of sodium chloride weighs 58.44 grammes. 58.44 grammes of sodium chloride are dissolved in one litre of water to produce one molar solution, or 1M.

Moles of solute per litre of solution is known as molarity (M).

Given: moles of NH3 = 0.355, volume of solution = 3.84 L

Molarity = 0.355 moles / 3.84 L = 0.0924 M

Therefore, the molarity of the solution is 0.0924 M.

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Explanation:

60 times and it matters why they need to in order to divide

Explanation:

According to your question,

no. a. ans would be like; chemical formula is defined as the an expression which determines no. and type of molecule of a compound.

b. no. ans; it tells that what type of compound is formed with the type and no. of atoms present in the atom.

c. no ans; the formulation of h2so4 states that it is acid named as hydrochloric acid which is formed by reacting of hydrogen (2 atoms ) ,sulpher (*1atom) and oxygen(4atoms).

Hope it helps...

Answer:

Exothermic Reaction

Product  = Calcium hydroxide + hydrogen

Explanation:

Answer:

is an assumption , in an idea that is proposed for the sake of argument so that it can be tested to see if it might be true.

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The mass (in grams) of fluorine the sample have is 2.91 g

First, we shall determine the mole of 9 grams of cobalt. Details below:

Mole = mass / molar mass

Mole of cobalt = 9 / 58.93

Mole of cobalt = 0.153 mole

Finally, we shall determine the mass of fluorine the present in the compound. Details below:

Mole = mass / molar mass

0.153 = Mass of fluorine / 19

Cross multiply

Mass of fluorine = 0.153 × 19

Mass of fluorine = 2.91 g

Thus, the mass of fluorine is 2.91 g

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Answer:3

Explanation:

The 195 represent in the isotope notation represents the atomic mass.

Isotope notation is a way of representing atoms of a particular element that have the same number of protons but different numbers of neutrons. Isotopes are identified by their atomic mass, which is the sum of the number of protons and neutrons in the atom's nucleus.

In the isotope notation, the number that comes after the element's symbol represents the mass number of the isotope. In the case of 195Pt, "195" represents the mass number of the isotope, which is the sum of the number of protons and neutrons in the nucleus of the atom.

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Answer:

2 H2 + O2 --->  2 H2O

Explanation:

Amount in the beginning:

- Left side : 2 H and 2 O

- Right side: 2H and 1 O

You need the same amount of H en O on each side. You are missing 1 O on the right side, so you add another one by placing 2 infront of O on the left side. Now the O is balenced.

The H is out of balance now. You have 4 on the right side and 2 on the left side. So you add 2 H on the left side, by putting a 2 ahead of H2. Now you have 4H in total on the left and on the right side. The reaction is now balenced.

Considering the definition of period, group and electronic configuration:

The elements are arranged in horizontal rows, called periods, and in columns, called groups.

The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).

There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level.

Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4. These 4 sub-levels are called: s, p, d, f.

The placement of the elements in the periodic table is done taking into account the electronic configuration.

In each period, the elements whose last level of their electronic configuration coincides with the number of the period appear.

On the other hand, in each group appear the elements that present the same number of electrons in the last occupied level or valence shell.

In summary:

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The median reaction at the second end point in the HCl and NaOH titration is: HCl + NaOH → NaCl + H2O

In a titration between hydrochloric acid (HCl) and sodium hydroxide (NaOH), the reaction involved is the neutralization reaction between an acid and a base. The balanced equation for this reaction is:

HCl + NaOH → NaCl + H2O

In this reaction, one mole of HCl reacts with one mole of NaOH to form one mole of NaCl (sodium chloride) and one mole of water.

During the titration process, the reaction occurs gradually as the base is added to the acid solution.

The first end point of the titration is reached when the moles of HCl and NaOH are stoichiometrically equivalent, meaning they react in a 1:1 ratio. At this point, all the HCl has been neutralized by the NaOH, and no excess of either reagent remains.

However, if the titration is continued beyond the first end point, the reaction between HCl and NaOH can still occur, albeit in a different ratio.

The second end point refers to the point where the moles of NaOH added exceed the stoichiometrically required amount to neutralize the HCl completely. As a result, any excess NaOH added after the second end point reacts with the excess HCl in a 1:1 ratio.

Therefore, the median reaction at the second end point in the HCl and NaOH titration is:

HCl + NaOH → NaCl + H2O

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A solution with 8.35 g of a non-electrolyte solute in 50.0 g naphthalene (Kfp = 6.90°C/m) freezes at 76.5°C. Pure naphthalene freezes at 81.0°C. The molar mass of the non-electrolyte is 256.134g /mol

The term molar mass is defined as the mass in grams of one mole of the compound.

Given:

Naphthalene usually freezes at 81°C

New Freeing Point = 76.5°C

Depression in freezing point

= 81°C - 76.5°C

= 4.5°C

We know depression in freezing point is given by the formula as below;

Kf x m

where m is the molarity

So, 4.5oC = 6.90°C/m x m

m = 0.652m

Molality = moles of solute dissolved per kilogram of solvent

50g of naphthalene is the solvent

50g = 0.05kg

Molality = moles of solute / 0.05

0.652 x 0.05 = moles of solute

Therefore, there are 0.0326 moles of non- electrolyte

0.0326 moles make 8.35g

So, in 1 mole there are 256.134g

Thus,the molar mass of the non-electrolyte is 256.134g /mol.

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The value of the equilibrium constant, Kc is 0.33.

The correct option is A.

The balanced chemical equation for the oxidation of NO by O2 is:

2 NO (g) + O2 (g) → 2 NO2 (g)

From the stoichiometry of the equation, we see that the mole ratio of NO to O2 consumed is 2:1. Therefore, if 3 moles of O2 are present at equilibrium, then 1.5 moles of NO have been consumed:

1.5 moles NO = 15.0 moles NO (initial) - 3.0 moles NO2 - 3.0 moles O2

Using the law of mass action, we can express the equilibrium constant (Kc) for the reaction as:

Ke = ([NO2]^2 / [NO]^2 [O2])

We know that at equilibrium, [O2] = 3.0 moles / 1.0 L = 3.0 M. To calculate [NO2], we need to use the stoichiometry of the equation and the fact that 1.5 moles of NO are consumed at equilibrium:

2 mol NO → 2 mol NO2

1.5 mol NO → 1.5 mol NO2

Therefore, [NO2] = 1.5 mol NO2 / 1.0 L = 1.5 M. Substituting the values into the equilibrium constant expression, we get:

Ke = ([NO2]^2 / [NO]^2 [O2])

Ke = (1.5 M)^2 / (1.5 M)^2 (3.0 M)

Ke = 0.333

Therefore, the answer is (a) 0.33.

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Answer: Shown below

Explanation:

CaCl2=calcium chloride

Mg(NO3)2=Magnesium nitrate

ZaCl2=Zinc Chloride

NH2Cl=Chloramine

AgNO2=Silver nitrate

NaCl= Sodium chloride

KI=Potassium iodide

PbSO4=Lead(II) Sulfate

n82CO3=Sodium carbonate

KNO3=Potassium nitrate

N82SO4=Sodium Sulfate.

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The name of the compounds and the involved ion are as follows;

Ionic compound is any of a large group of chemical compounds consisting of oppositely charged ions, wherein electron transfer, or ionic bonding, holds the atoms together.

Ionic compounds, when in an aqueous solution, dissociates into its respective ions. This question gives the chemical formula of certain compounds. For example, the sodium ions attract chloride ions and the chloride ion attracts sodium ions. The result is a three-dimensional structure of alternate Na⁺ and Cl⁻ ions.

The names of the chemical compound and the ionic elements that make them up are given in the main answer part.

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Answer:

The mitochondria is the organelle found in plant and animal cells and is involved in making cellular energy from respiration.

Explanation:

The pH of the sodium hydroxide (NaOH) solution at the given concentration of 0.000519 M is determined as 10.72.

The pH of a solution is defined as the logarithm of the reciprocal of the hydrogen ion concentration  [H+] of the given solution.

Concentration of the basic solution, [OH⁻] = 0.000519

pOH = -log[OH⁻]

pOH = -log[0.000519]

pOH = 3.28

pH + pOH = 14

pH = 14 - pOH

pH = 14 - 3.28

pH = 10.72

Thus, the pH of the sodium hydroxide (NaOH) solution at the given concentration of 0.000519 M is determined as 10.72.

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The atoms have different types of bonds holding molecules together and leads to evaporation.

Thus, A crucial stage in the Earth's water cycle is evaporation, which is the process by which water transforms from a liquid to a gas or vapor. Evaporation at the molecular level requires the interface to break at least one extremely strong intermolecular connection between two water molecules.

The chemical mechanism by which an evaporating water molecule acquires sufficient energy to escape from the surface has remained mysterious despite the significance of this activity.

Here, we demonstrate that the high kinetic energy of the evaporated water molecule is enabled by a precisely timed formation and dissolution of hydrogen bonds involving at least three water molecules at the interface, the recoil of which allows one water molecule to escape.

Thus, The atoms have different types of bonds holding molecules together and leads to evaporation.

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Answer:

Your reasoning that the shadow is the shortest at mid-day is spot-on! The wording of the question is the key to the answer. It says that the measurements were made in Summer. So this means that British Summer Time (BST) is being applied.

Answer:

0.422 M

Explanation:

Equation of the reaction,

2HCl(aq) + Ba(OH)₂(aq) ⇒ BaCl₂(aq)+2H₂O(l)

From the recation above,

2 moles of HCl is needed to neutralize 1 mole of Ba(OH)₂.

Using,

C'V'/CV = a/b......................... Equation 1

Where C' = concentration of acid, C = concentration of base, V' = volume of acid, V = volume of base, a = number of moles of acid, b = number of moles of base.

make C' the subject of the equation.

C' = aCV/bV'................. Equation 2

a = 2 mole, b = 1 mole, C = 0.0154 M, V = 27.4 mL, V' = 20 mL

Substitute into equation 2

C' = (2×0.0154×27.4)/(1×20)

C' = 0.422 M.

Hence the concentration of acid is 0.422 M

Explanation:

The River rushing down through the bottom of the canyon would be your answer but if not then you can try The Rocks falling due to the gravity :)

This extremely high temperature indicates that under normal conditions, you do not need to worry about your car tire bursting from overheating as it is unlikely to reach such extreme temperatures.

To determine the temperature at which the tire will burst, we can use the ideal gas law equation:

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.

Rearranging the equation to solve for temperature, we have:

T = PV / (nR)

Given that the pressure threshold for bursting is 1.4 x 10^3 kPa, the volume is 30 L, and the number of moles of air is 2.5 mol, we can substitute these values along with the ideal gas constant R = 8.314 J/(mol K) into the equation.

T = (1.4 x 10^3 kPa) * (30 L) / (2.5 mol * 8.314 J/(mol K))

Converting kPa to Pa and L to m^3, and simplifying the equation, we find:

T ≈ 20,993 K

This extremely high temperature indicates that under normal conditions, you do not need to worry about your car tire bursting from overheating as it is unlikely to reach such extreme temperatures.

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Out of the given choices, the amino acids that has a side chain that is capable of hydrogen bonding with other polar molecules is Ser (Serine).

In the fields of organic and biochemistry, a side chain is a chemical group that is connected to the "main chain" or backbone of a molecule and serves as an attachment point for other parts of the molecule. A molecule's side chain is a hydrocarbon branching element that is coupled to a larger hydrocarbon backbone. This element is known as the side chain. There is only one amino acid on this list that possesses a R group that is able to form a hydrogen bond, and that is serine.  Both serine and threonine have hydroxyl groups located on the side chains of their amino acids. Because these polar groups are located so close to the main chain, they are able to make hydrogen bonds with the main chain.

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The volume of \(N_2O_5\) needed to produce 9.64 L of \(NO_2\) is 4.97 L, calculated using stoichiometry and the ideal gas equation.

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Answer:

\(\boxed {\boxed {\sf 38.11 \ L}}\)

Explanation:

To find the volume, we need to convert grams to moles, then moles to liters.

We convert grams to moles using the molar mass. This is the mass of 1 mole of a substance. It is the same as the atomic mass found on the Periodic Table, but the units are grams per mole (not atomic mass units).

We have the compound carbon dioxide or CO₂. Look up the molar masses of the individual elements.

Notice that oxygen has a subscript of 2, so there are 2 atoms in each molecule. We have to multiply oxygen's molar mass by 2 before adding carbon's.

Use this value as a ratio.

\(\frac {44.009 \ g\ CO_2}{1 \ mol \ CO_2}\)

Multiply by the given number of grams: 74.87

\(74.87 \ g\ CO_2*\frac {44.009 \ g\ CO_2}{1 \ mol \ CO_2}\)

Flip the ratio so the units of grams cancel.

\(74.87 \ g\ CO_2*\frac {1 \ mol \ CO_2}{44.009 \ g\ CO_2}\)

\(74.87 *\frac {1 \ mol \ CO_2}{44.009 }\)

\({74.87 \ mol \ CO_2}{44.009 } = 1.701242928 \ mol \ CO_2\)

Any gas at standard temperature and pressure (STP) has a volume of 22.4 liters per mole.

\(\frac {22.4 \ L}{1 \ mol \ CO_2}\)

Multiply by the number of moles we calculated.

\(1.701242928 \ mol \ CO_2*\frac {22.4 \ L}{1 \ mol \ CO_2}\)

The units of moles cancel.

\(1.701242928 *\frac {22.4 \ L}{1 }\)

\(1.701242928 *{22.4 \ L}= 38.10784158 \ L\)

The original measurement has 4 significant figures, so our answer must have the same. For the number we calculated, that is the hundredth place.

The 7 tells us to round the 0 10 a 1.

\(38.11 \ L\)