A 700.0 mL gas sample at STP is compressed to a volume of 200.0 mL, and the temperature is increased to 30.0 degrees Celsius. What is the new pressure of gas at kPa?

Answers

Answer 1

Answer: According to the ideal gas law, there is equation PV=nRT. So the same gas has the relationship of P1V1/T1=P2V2/T2. The unit of temperature is K. Then the answer is 385.4 kPa.

Answer 2

Answer:

Final answer:

Using the combined gas law, we find that the new pressure of the gas sample, after it's compressed and heated, is approximately 353.8 kPa.

Explanation:

The subject of this question is gas laws, specifically the combined gas law which states that the ratio of the product of pressure and volume and the absolute temperature of a gas is constant. We apply this law to calculate the new pressure of the gas sample. Starting from the conditions of STP (Standard Temperature and Pressure, defined as 273.15 K and 1 atm i.e., 101.325 kPa), the volume of gas is decreased from 700.0 mL to 200.0 mL and the temperature is increased from 273.15 K to 30.0 degrees Celsius (or 303.15 K in absolute terms).

We set up the equation P1*V1/T1 = P2*V2/T2, where P1 = 101.325 kPa, V1 = 700.0 mL, T1 = 273.15 K, V2 = 200.0 mL, and T2 = 303.15 K. Plugging in these numbers and solving for P2 (the new pressure), we get P2 = P1*V1*T2 / (T1*V2) = 101.325 kPa * 700.0 mL * 303.15 K / (273.15 K * 200.0 mL) = approximately 353.8 kPa.

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Sodium chloride, NaCl forms in this reaction between sodium and chlorine. 2Na(s) + Cl2(g) → 2NaCl(s) How many moles of NaCl result from the complete reaction of 3.9 mol of Cl2? Assume that there is more than enough Na.

Which of the following is not part of daltons atomic theory

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Atoms of an element are alike.

Answer:

Atoms of the same element are identical.

Which of these changes most likely results in an increase in the volume of a gas? A0 Decreasing the pressure on the gas. B) Cooling the gas. C) Removing some of the gas form the sample.

Answers

The answer is (B) decreasing the pressure on the gas, as Boyle's law states that at a constant temperature, the volume of a gas is inversely proportional to its pressure.

Removing some of the gas from the sample is the change that most likely results in a decrease in the volume of the gas, rather than an increase. This is because decreasing the amount of gas in the sample will reduce the total volume of the gas.

On the other hand, cooling the gas will typically cause it to contract, reducing its volume. Similarly, decreasing the pressure on the gas will typically cause it to expand and increase in volume.

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Hydrogen bonding is a type of(1) strong covalent bond
(2) weak ionic bond
(3) strong intermolecular force
(4) weak intermolecular force

Answers

Option 3. strong intermolecular force

Certain substances such as H2O, HF, NH3 from hydrogen bonds, and the formation of which affects properties (mp,bp,solubility) of substance. Other compounds containing OH and NH2 groups also form hydrogen bond. Molecules of many organic compounds such as alcohols, acids, amines, and amino acids contain these groups, and thus hydrogen bonding plays an important role in biological science.

A mixture consists of sand and an aqueous salt solution. Which can be used to seperate the same, salt, and water from each other

Answers

The process which can be used to separate salt from the sand is leaching since salt is soluble in water thus it goes to the water leaving the sand behind. To separate salt from the water, you can allow the water to evaporate where it undergoes a phase change.

How do you find the volume occupied by 454 grams of copper if the density equals 8.92 g/mL?

Answers

V=M/P
M=454g
p=8.92
v=50.896860986
3 significant figures
v= 50.9

Final answer:

The volume occupied by 454 grams of copper, given a density of 8.92g/mL, can be calculated using the formula for density (Density = Mass / Volume). When rearranged to find volume (Volume = Mass / Density) and substituting the given values, the volume occupied is approximately 50.9 mL.

Explanation:

When calculating volume in chemistry, we use the formula for density, which is: Density = Mass / Volume. In this case, the given values are mass (454g) and density (8.92g/mL). If we rearrange the formula to solve the volume, we get: Volume = Mass / Density. So, if we substitute the given values into the equation, we obtain: Volume = 454g / 8.92g/mL. In performing the operation, we get approximately 50.9 mL. Hence 454 grams of copper occupy 50.9 mL of volume.

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The decomposition of ammonia gas (a process that occurs at high temps) is 2KH3(g) --> N2(g) 3H2(g). If a balloon was filled with 3.5L of ammonia gas and all of the gas decomposed, what would be the total volume of gas in the container? Assume the pressure and temp remains constant.

Answers

Ammonia gas is $\text{NH}_3$ .

Since the ammonia gas took up 3.5 L at first, using Avogadro's Law, we know that 2 mols of a gas took up 3.5 L at first, but now there are 4 mols of gas in total after the decomposition. Therefore, we can conclude that now the volume in total is 7 L.

Answer : The total volume of gas in the container will be, 7 liters

Explanation :

The given balanced chemical reaction is,

$2NH_3(g)\rightarrow N_2(g)+3H_2(g)$

From the balanced chemical reaction we conclude that

2 mole of ammonia gas decomposes to give 1 mole of nitrogen gas and 3 moles of hydrogen gas.

According to the Avogadro's Law, the volume of the gas is directly proportional to the number of moles of the gas at constant pressure and temperature.

$V\propto n$