What is the percent of H in
Ca(C2H3O2)2?
(Ca = 40.08 g/mol, C = 12.01 g/mol,
H= 1.01 g/mol, O = 16.00 g/mol)
[? ] % H

Answer:

d. The number of neutrons equals the number of electrons.

Explanation:

All atoms are electrically neutral as they contain the same number of protons (positive charges) and electrons (negative charges).

Answer:

b

Explanation:

Answer:

ita b

Explanation:

trust fam

Interstellar gas is composed mainly of three molecules: ammonia, methane, and water vapor. These molecules primarily consist of hydrogen and carbon, although they are typically found in small concentrations compared to other elements in interstellar gas.

The majority of interstellar gas consists of hydrogen and helium, but the exact proportions can vary based on the location in space. Generally, one can expect anywhere from 90% to 99% hydrogen, and 9% to 10% helium by weight. However, when accounting for the number of atoms present, there is typically 10% hydrogen and 90% helium.

This means that, although helium is less dense than hydrogen and accounts for less of the overall mass, it actually makes up a larger portion of the interstellar gas than hydrogen does in terms of numbers of atoms. We can commonly find nitrogen, oxygen, carbon dioxide, carbon monoxide, and other molecules in interstellar gas, but ammonia, methane, and water vapor are the primary components and likely the most abundant.

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Correct question is :.

interstellar gas is composed mainly of group of answer choices ammonia, methane, and water vapor. some hydrogen, but mainly carbon dioxide. only hydrogen. 90% hydrogen, 9% helium by weight. 10% hydrogen, 90% helium by numbers of atoms. explain.

The ideal gas law is described by

PV = nRT,

Here P =pressure,

V =volume,

n =number of moles,

R =the universal gas constant,

T = temperature.

In the provided case, we have Container A, which holds 737 mL of ideal gas at 2.10 atm, and Container B, which holds 169 mL of ideal gas at 4.20 atm. We will use the ideal gas law to find the total pressure of the gas mixture.To do this, we need to find the number of moles of gas in each container.

We can use the formula    n = PV/RT     to calculate the number of moles of gas,

Since the temperature is constant, we can use the following formula: n = PV/RT

Container A:     n = (2.10 atm)(0.737 L)/(0.0821 L·atm/mol·K)(298 K)n = 0.0316 mol

Container B:     n = (4.20 atm)(0.169 L)/(0.0821 L·atm/mol·K)(298 K)n = 0.00868 mol

The total number of moles of gas is the sum of the number of moles in Container A and Container B:

n(total) = n(A) + n(B)n(total) = 0.0316 mol + 0.00868 moln(total) = 0.0403 mol

Now, we can use the ideal gas law to find the total pressure of the gas mixture. We can rearrange the formula to solve for pressure as follows:

P = nRT/VP = (0.0403 mol)(0.0821 L·atm/mol·K)(298 K)/(0.737 L + 0.169 L)P = 1.59 atm

Therefore, the resulting pressure when the gases mix together is 1.59 atm.

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At 1 atm of pressure and a temperature of 0°C, all three phases of water (liquid, solid, and gas) can exist simultaneously.

This phenomenon is known as triple point, and it occurs at a specific temperature and pressure where the three phases of water can coexist in equilibrium. At triple point, the vapor pressure of water is equal to the liquid and solid water's vapor pressures, and they form a single point on the phase diagram of water.

In other words, at triple point, the liquid, solid, and gas phases of water are in equilibrium with each other, and they cannot be separated by simple physical means. This is why triple point is an important scientific measurement, as it provides a fixed point on the phase diagram of water from which other points can be calculated.  

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Answer:

Radiant energy passes across Earth's system boundary, but not mass.

Explanation:

In a closed system, no substance can escape or be added to it. Energy, on the other hand, can still reach the system or leave the system again.

Answer: radiant energy passes across Earth's system boundary, but not mass

Explanation:

100% K12 test

Answer:

electrolytes

Explanation:

If an electrical current can run though a solution, it is said to contain  ions and the solution in which ions are present is called as electrolytes.

An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.

Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.

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it is B I'm 99% sure it is b

Answer:

D

Explanation:

Radiation is the only method of heat transfer that does not require matter in order for the heat to move. Earth is heated by the Sun through the process of radiation.

Mr Hexane = 86 g/mol

mol hexane = 258 : 86 = 3

mol cyclohexane = mol hexane = 3

mass cyclohexane = 3 x 84 = 252 g

In the solid matter , atoms or the molecules are in the definite shape and the fixed volume.

In the solid state of the matter the particles are very close to each other. There is a very tiny gap between the particle, they are very tough to compress. The force of the attraction between the particles are very strong. The rate of diffusion in the solid matter is very low. The examples of the soli matter is sugar , wood, rock, solid ice.

Thus, in the solid state of the matter the molecules or the atoms have the fixed volume and have definite shape.

This question is incomplete , the complete question is :

In solid matter, atoms or molecules are in ----------- shape and --------  volume.

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Consider polonium metal, the only metal under to exhibit the simple cubic crystal structure at STP conditions. The maximum diameter of sphere, in pm, that would fit perfectly within the interstitial space (empty space) in the middle of the simple cubic unit cell is 286.44 pm.

Polonium is a radioactive element with atomic number 84 and symbol Po. Polonium metal exhibits the simple cubic crystal structure at STP conditions. The simple cubic unit cell has one atom at each of its eight corners.The formula for the calculation of maximum diameter of sphere which can be accommodated within the interstitial void is given as:diameter of the sphere = sqrt(3) * edge length of the unit cell / 2The edge length of the simple cubic unit cell is equal to the diameter of the polonium atom, so we can assume it to be 330 pm.

We can plug this value in the above formula to calculate the maximum diameter of the sphere that can fit perfectly within the interstitial space of the simple cubic unit cell:

Maximum diameter of sphere = sqrt(3) * 330 pm / 2= 286.44 pm.

Therefore, the maximum diameter of the sphere that can fit perfectly within the interstitial space in the middle of the simple cubic unit cell is 286.44 pm.

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Advantages of mineral-based lubricants:

Chemical stability is the advantage of mineral-based lubricants over vegetable oil-based lubricants when used in aircraft engines.

Lubricants used in aircraft engines:

Mineral oils are used in modern aircraft engines because they can maintain a specified viscosity over a wide range of temperatures. For instance, the capacity to function in temperatures between -10°C and 40°C is crucial for the start-up of an aircraft engine. Greater grade oils can be utilized at higher ambient and startup temperatures, but they are useless in arctic or freezing circumstances, where a synthetic multigrade would be more appropriate.

Because mineral oils are more fluid even at low temperatures, they can reach every part of an aircraft's engine far faster than vegetable oils can. As a result, the engine will start up with less wear.

Additionally, compared to vegetable oils, mineral oils can result in significant fuel savings of between 1.5 percent and 3 percent. The usage of mineral oils makes sense for operators attempting to stay competitive in the airline industry since it results in lower fuel costs as well as reduced expenses for maintenance and engine downtime due to excessive wear and extended active service life.

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To calculate the enthalpy change of the precipitation reaction, we need to first calculate the amount of heat absorbed or released by the reaction. We can use the formula:

q = m * c * ΔT

where q is the heat absorbed or released, m is the mass of the mixture, c is the specific heat capacity, and ΔT is the change in temperature.

We can calculate the mass of the mixture as:

mass = 50 mL AgNO3 + 50 mL NaCl = 100 mL
mass = 100 g (since 1 mL of water has a mass of 1 g)

Using the formula above, we can calculate the heat absorbed or released by the reaction:

q = 100 g * 4.2 J/g°C * (21°C - 20°C)
q = 420 J

Since the reaction is exothermic (heat is released), the enthalpy change (ΔH) will be negative. We can use the formula:

ΔH = -q/n

where n is the number of moles of limiting reactant. In this case, AgNO3 is the limiting reactant since it is in lower concentration.

We can calculate the number of moles of AgNO3 as:

moles AgNO3 = concentration * volume
moles AgNO3 = 0.100 M * 0.050 L
moles AgNO3 = 0.005 moles

Therefore, the enthalpy change of the precipitation reaction is:

ΔH = -420 J / 0.005 moles
ΔH = -84,000 J/mol or -84 kJ/mol

Note: We converted J/mol to kJ/mol for convenience in reporting the result.

The enthalpy change of the precipitation reaction is -336 kJ/mol.

To calculate the enthalpy change of this precipitation reaction, we need to first determine the moles of each reactant.

The student mixed 50 mL of 0.100 M AgNO3, which means there are 0.005 moles of AgNO3 present (50 mL is equivalent to 0.050 L, and Molarity = moles/L). Similarly, the 50 mL of 0.1 M NaCl contains 0.005 moles of NaCl.

The reaction between AgNO3 and NaCl forms AgCl and NaNO3. Based on the stoichiometry of the balanced equation, we can see that 0.005 moles of AgNO3 will react with 0.005 moles of NaCl, producing 0.005 moles of AgCl.

Next, we need to determine the amount of heat transferred during the reaction. We can use the equation:

\(q = mCΔT\)

Where q is the heat transferred, m is the mass of the mixture (100 g), C is the specific heat capacity (4.2 J/g°C), and ΔT is the change in temperature (final temperature minus initial temperature).

The initial temperature is not given, so we cannot calculate the actual change in temperature. However, we can assume that the initial temperature was the same as the room temperature, which is often taken as 25°C.

Therefore,\(ΔT\) = 21°C - 25°C = -4°C

Substituting into the equation, we get:

q = 100 g x 4.2 J/g°C x -4°C
q = -1680 J

Since the reaction produces 0.005 moles of AgCl, we can calculate the enthalpy change per mole:

\(ΔH = q/n\)

\(ΔH\)= -1680 J / 0.005 mol
\(ΔH\) = -336000 J/mol

The enthalpy change of the precipitation reaction is -336 kJ/mol.

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When 6.0 liters of \(C_2H_6\) are combusted, the total volume of \(CO_2\) formed at STP is approximately 12.02 liters.

To determine the total volume of \(CO_2\) formed when 6.0 liters of \(C_2H_6\) are combusted, we need to use the balanced chemical equation and stoichiometry.

From the balanced chemical equation:

2 \(C_2H_6\)(g) + 7 O2(g) → 4 \(CO_2\)(g) + 6 H2O(g)

We can see that the molar ratio between \(C_2H_6\) and \(CO_2\) is 2:4, which simplifies to 1:2. This means that for every 2 moles of \(C_2H_6\) combusted, 4 moles of \(CO_2\) are produced.

To solve this problem, we need to convert the given volume of \(C_2H_6\) to moles and then use the stoichiometry to determine the volume of \(CO_2\) produced.

Step 1: Convert volume of \(C_2H_6\) to moles:

Using the ideal gas law, PV = nRT, at STP (Standard Temperature and Pressure), one mole of any ideal gas occupies 22.4 liters. Therefore, 6.0 liters of \(C_2H_6\) is equal to 6.0/22.4 = 0.268 moles of \(C_2H_6\).

Step 2: Apply stoichiometry to find moles of \(CO_2\):

Since the molar ratio between \(C_2H_6\) and \(CO_2\) is 1:2, we multiply the moles of C2H6 by the stoichiometric coefficient ratio:

0.268 moles of \(C_2H_6\) * (4 moles \(CO_2\) / 2 moles \(C_2H_6\)) = 0.536 moles of CO2.

Step 3: Convert moles of \(CO_2\) to volume:

At STP, 1 mole of any ideal gas occupies 22.4 liters. Therefore, 0.536 moles of \(CO_2\) is equal to 0.536 * 22.4 = 12.02 liters of \(CO_2\).

Thus, when 6.0 liters of \(C_2H_6\) are combusted, the total volume of \(CO_2\) formed at STP is approximately 12.02 liters.

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The very first step is the elimination of the salt that is NaCl that is when the copper chloride is reacting with the sodium carbonate then the Na gives its 1 electron to the chloride ion and together makes a compound.

The balanced chemical equation for the reaction between sodium carbonate (Na2CO3) and copper(II) chloride (CuCl2) is as follows:

CuCO3 + 2NaCl = CuCl2 + Na2CO3

In this equation, one CuCl2 molecule interacts with one Na2CO3 molecule to form one CuCO3 molecule and two NaCl molecules.

We must ensure that each element has the same amount of atoms on both sides of the equation in order to achieve equilibrium. Here's how to strike a balance:

CuCO3 + 2NaCl = CuCl2 + Na2CO3

Now the equation balances. Each element has an equal amount of atoms on both sides of the equation.

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As we look around space, we find that most of it is composed of atoms of hydrogen. When the hydrogen combines with carbon, it forms an organic molecule. Which is the basis for all living things. Combining different elements together form different substances. A group of two or more atoms that are bonded together is called a molecule. And when the elements are combined in a specific way, or ratio, the substance is called a compound (e.g. water).

A pure material with only one type of atom makes up an element. A molecule is a pure material that contains either only one kind of atoms or atoms from many types of atoms.

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The given question is incomplete, so the most probable complete question is,

As we look around space we find that most of it is composed of ___. of hydrogen. When the hydrogen combines with carbon it forms a ___. which is the basis for all living things. Combining different ___ together form different substances. A group of two or more atoms that are bonded together is called a __. And when the elements are combined in a specific way, or ratio, the substance is called a ___ (e.g. water).

Answer:

Homeostasis helps animals maintain stable internal and external environments with the best conditions for it to operate. It is a dynamic process that requires constant monitoring of all systems in the body to detect changes, and mechanisms that react to those changes and restore stability.

Explanation:

i would say C. i hope im right

sorry if you get it wrong

Flexible container at  initial volume of 5.12 l contains 8.51 mol of gas. The more gas is then added to the container until it reaches a final volume of the 13.3 l. The number of moles of gas added to the container is 22.1 mol.

The ideal gas equation is as follows :

P V = n R T

The  pressure and temperature of the gas remain constant, WE GET

V₂ / V₁ = n₂ / n₁

n₂ = V₂ n₁ / V₁

Where,

V₁ = 5.12 L

V₂ = 13.3 L

n₁ = 8.51 mol

n₂  = ( 13.3 × 8.51 ) / 5.12

    = 22.1 mol

The number of the moles added is 22.1 mol.

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Answer:

20L

Explanation:

The following data were obtained from the question:

Initial volume (V1) = 10L

Initial Temperature (T1) = stp = 273K

Final temperature (T2) = 546K

Final volume (V2) =..?

The new volume of the gas can be obtained by using the Charles' law equation as shown below:

V1/T1 = V2/T2

10/273 = V2/546

Cross multiply to express in linear form

273 x V2 = 10 x 546

Divide both side by 273

V2 = (10 x 546) / 273

V2 = 20L

Therefore, the new volume of the gas is 20L.

True, the specific heat capacity of an object depends only on the substance from which the object is made.

Specific heat capacity is defined as the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius.

The SI unit of specific heat capacity is joule per kelvin per kilogram.

The specific heat capacity at constant volume is written as,

\(C_{V} = (du/dt)_{V}\)

The specific heat capacity at constant pressure is written as,

\(C_{P} = (dh/dT)_{P}\)

here, u is the internal energy of system in kJ/kmol and h is the enthalpy of system in kJ/kmol.

For an Ideal gas the relation between heat capacity at constant volume and at constant pressure can be written as ,

\(C_{P} - C_{V} = R\)

Specific heat capacity is an intensive property i.e., independent of quantity. No matter how much substance we have, its ability to absorb heat energy at a particular temperature is the same.

So, we can say that the specific heat capacity of an object depends only on the substance from which the object is made and not on its quantity.

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Answer:

value of standard atmospheric pressure​  is atmosphere

Answer:

Na, Cu, and Br will form positive ions

Explanation:

Na, Cu, and Br have more protons than electrons, so they will form positive ions.

Na, Cu, and Br are all elements that have an atomic number greater than their number of electrons. This means that they have more protons than electrons, so they will form positive ions when they react with other elements. Na will form Na+, Cu will form Cu+ and Br will form Br+.

Answer:

2.41 mol

Explanation:

53.9 L x 1 mol/22.4 L = 2.41 mol

Volume displaced by jewelry, V = 278 - 200 = 78 ml

Also, 1 ml = 1 cm³

We know, by water displacement method the volume of water displaced by an object it equals to its own volume.

So, volume of jewelry, V = 78 ml = 78 cm³.

Also, weight of jewelry is , w = 122 gm.

Now, we know density is given by :

\(d=\dfrac{w}{V}\\\\d=\dfrac{122\ gm}{78\ cm^3}\\\\d=1.56\ gm/ cm^3\)

Hence, this is the required solution.

Answer:

Carbon monoxide

Explanation:

The molecule has the carbon and oxygen atoms in equal amounts.

Answer:

0.320 g Cu.

Explanation:

Hello there!

In this case, case, according to the presented chemical reaction, it is possible to determine that the mole ratio of zinc to copper is 1:1 and therefore, we will have the same amount of atoms for the both of them. Moreover, since one mole of copper contains 6.022x10²³ atoms of this element, with a mass of 63.546 g (molar mass); it is possible for us to write up the following mathematical setup in order to calculate the produced grams of copper:

\(3.03x10^{21}atoms Zn*\frac{1atom Cu}{1atom Zn}*\frac{1molCu}{6.022x10^{23}atoms Cu}*\frac{63.546gCu}{1molCu} \\\)

Thus, the numerical result turns out to be:

0.320 g Cu

Best regards!

Answer:

C metallic bond is the answer

3H₂(g)+N₂(g)——> 2NH₃ (g) , here the volume of NH₃(g) measured at STP is produced when 2.15 L of H₂(g) reacts is approximately 1.58 L of NH₃ gas will be produced when 2.15 L of H₂ reacts at STP.

3H₂(g) + N₂(g) → 2NH₃ (g)

3 moles of H₂ reacts to produce 2 moles of NH3. Therefore, one need to first calculate the number of moles of H₂ in 2.15 L.

PV = nRT

P= is the pressure (STP has a pressure of 1 atm), V =is the volume in liters, n is the number of moles, R= is the ideal gas constant (0.0821 L·atm/mol·K), T =is the temperature in Kelvin (STP has a temperature of 273 K).

Here, 

n(H₂) = (P(H₂) × V(H₂)) / (R × T)

Assuming the pressure of H₂ is also 1 atm at STP, and substituting the values:

n(H₂) = (1 atm × 2.15 L) / (0.0821 L·atm/mol·K × 273 K) n(H₂) ≈ 0.0954 mol

According to the balanced equation, 3 moles of H₂ react to produce 2 moles of NH3. Therefore, one can determine the number of moles of NH₃ produced:

n(NH₃ ) = (2/3) × n(H₂) n(NH₃ )

≈ (2/3) × 0.0954 mol n(NH₃ )

≈ 0.0636 mol

V(NH₃ ) = (n(NH₃  × R × T) / P(STP)

Substituting the values:

V(NH₃ ) = (0.0636 mol × 0.0821 L·atm/mol·K × 273 K) / (1 atm) V(NH₃ )

≈ 1.58 L

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