Gas Laws and Molar Mass Calculation

How many of these pressure values are standard pressure?

700 torr

0.5 atm

10.1 kPa

• Zero

• One

• Two

• Three

How many of these temperature values are standard temperature?
273 K
0 ⁰C

• Zero
• One
• Two
• Depends on pressure

Calculate the volume that a 0.323-mol sample of a gas will occupy at 265 K and a pressure of 0.900 atm.

• 7.18 L 
• 7.81 L
• 4.63 L
• 4.36 L

Determine the Kelvin temperature required for 0.0470 mol of gas to fill a balloon to 1.20 L under .998 atm pressure. 

• 0 K 
• 107 K 
• 207 K 
• 307 K 

Find the density of Neon gas (Ne) at .725 atm and 25°C.

D=MP/RT

• .35 g/L

• .47 g/L

• .60 g/L

• .79 g/L

At 250 K and 1.75 atm, a gas has a density of 2.73 g/L. What is the molar mass of the gas?

M=DRT/P

• 32.02 g/mol

• 42.15 g/mol

• 48.91 g/mol

• 54.28 g/mol

At standard temperature and pressure (0 ⁰C, 760 torr), what volume would 4.0 grams of helium gas (He) occupy?

• 33.6 L

• 22.4 L

• 44.8 L

• 11.2 L

How many moles of gas are contained in 890.0 mL at 21.0 °C and 750.0 mm Hg pressure?

• .036 mol

• .0047 mol

• .509 mol

• .068 mol

How many liters of gas are there in 44 g of bromine gas at STP? (Remember bromine is diatomic!)

• 3.50 L

• 3.08 L

• 12.34 L

• 6.16 L

1.09 g of H₂ is contained in a 2.00 L container at 20.0 °C. What is the pressure in this container in atm?

• 14.29 atm
• .443 atm
• 6.56 atm
• 3.28 atm