# Chemistry

A 255mL gas sample contains argon and nitrogen at a temperature of 65 degrees celsius. The total pressure of the sample is 725mmHg and the partial pressure of argon is 231 mmHg. what mass of nitrogen is present in the sample?

1. 👍
2. 👎
3. 👁
1. Ptotal = pN2 + pAr
You know Ptotal and pAr. Solve for pN2.
Then PV = nRT, substitute and solve for n N2 then use mols N2 = n = grams/molar mass and solve for grams.

1. 👍
2. 👎
2. Ptot= pN2 + pAR; (725mmHg-231mmHg=494mmHg)
494mmHg*(1atm/760mmHg)= 0.65atm
65celsius+273 = 338K
V=0.255L
R= 0.0821 Latm/mol K

Ideal Gas Law: PV=nRT
n N2 = (PV/RT) plug in above values to equation
n= (0.65atm * 0.255L) / (0.0821 Latm/molK * 338K)
moles N2 (n) = 0.00597 mols

mass N2= (0.00597 mols)/ (28.02 g/mol)= 0.167 g N2 present in sample

1. 👍
2. 👎

## Similar Questions

1. ### Chemistry

A 100g sample of water at 90 degrees celsius is added to a 100g sample of water at 10 degrees celsius. The final temperature of the water is which of the following: a) between 50 degrees celsius and 90 degrees celsius b) 50

2. ### Chemistry

A sample of argon gas has a volume of 735 mL at a pressure of 1.20 atm and a temp of 112 degrees Celsius. What is the final volume of the gas, in milliliters, when the pressure and temp of the gas is changed to A.) 658 mmHg and

3. ### Chemistry

A sample of 62.3 CM^3 of argon gas at 18°c was contained at a pressure of 155 kPa in a j-shaped tube with Mercury. Later the temperature changed. When the Mercury level was adjusted to give the same pressure of argon, the gas

4. ### physics

Suppose that, on a day when the outside temperature is 15 degrees Celsius, we fill a balloon with pure nitrogen gas, of which the molar mass is 28 grams per mole. Now suppose that we want to heat up a second (equally large)

1. ### Chemistry

If a nitrogen gas sample occupies a volume of 2.55 L at 22.0 degrees Celsius and 0.860 atm, what is the mass of the N2 gas?

2. ### Chem hw!

1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas?

3. ### Chem

Can someone check these homework answers please? 32. The barometric pressure measured outside an airplane at 9 km was 259 mmHg. Calculate the pressure in kPa. 34.5 kPa 36. A diving bell is a container open at the bottom. As the

4. ### Chemistry

A mixture consists of 45% oxygen, 12% argon, and 43% nitrogen by volume. A sample of this mixture has a pressure of 2.0 atm in a 5.3 L container at 350 K temperature. How many moles of gas are in the container?

1. ### Physics

Incandescent lightbulbs are filled with and inert gas to lengthen the filament life. With the current off ( at t= 20.0 degrees Celsius), the gas inside a lightbulb has a pressure of 115kPa. When the bulb is burning, the

2. ### Chem-organic, bio, intro

A gas mixture contains oxygen and argon at partial pressures of 0.60 atm and 425 mmhg. If nitrogen gas added to the sample increases the total pressure to 1250 torr, what is the partial pressure in Torr of the Nitrogen added?

3. ### Chemistry

A 10.8g sample of a gas has a volume of 5.25L at 25 degrees Celsius and 766mmHg. If 2.3g of the same gas is added to this constant 5.25L volume and the temperature raised to 68 degrees Celsius, what is the new gas pressure?

4. ### Chemistry

At 125 degrees Celsius, the pressure of a sample of He gas is 345 mmHg. At what temperature degrees Celsius will the pressure become 690 mm Hg, if the volume remains constant?