Ideal Gas & Gas Stoichiometry - Practice # 6

What is Standard Temperature and Pressure (STP)?

• 1 Degrees Celsius and 0 atm

• 0 Degrees Celsius and 1 atm

• 0 Kevin and 10 atm

• 273 Celsius and 273 atm

At STP, what is pressure in atmospheres?

• 1 atm
• 10 atm
• 0 atm
• 100 atm

If the pressure exerted by a gas at 25 degrees C in a volume of 0.044 L is 3.81 atm, how many moles of gas are present?

• .002766 mole
• .0069 mol
• 2.766 mol
• 9.887 mol

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

What is the pressure in atmospheres of a 0.108-mol sample of helium gas at a temperature of 20.0 degrees C if its volume is 0.505 L?

• 90.7 atm
• 22.4 atm
• 29.3 atm
• 5.14 atm

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 

What volume of hydrogen will be produced at STP by the reaction 67.3 g of magnesium with excfess water according to the following reaction?
1Mg + 2H₂O --> Mg(OH)₂ + H₂

• 62L
• 65L
• 31L
• 124L

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Mg₃N_2(s) + 3H₂O_(l) ––> 3 MgO + 2NH_3(g)
If 10.3 g of magnesium nitride is used, what volume of ammonia gas would be collected at 20˚C and 0.989 atm?

• 27.1 L H₂
• 4.96 L H₂
• 0.204 L H₂
• 10.3 L H₂

Tags

NGSS.HS-PS1-7

All alkali metal react with water to produce hydrogen gas and the corresponding alkaline metal hydroxide. A typical reaction is that between lithium and water :
 2Li(s) + 2H₂O(l) →2LiOH(aq) + H₂(g)
Calculate the mass of H2 gas formed when 40.0 g of Li react with water [Ar H =1.0, Li = 6.9, O =16.0]

• 4.21 g
• 7.31 g
• 5.80 g
• 4.42 g

Tags

NGSS.HS-PS1-7

Ammonia is produced from the reaction of nitrogen and hydrogen gases. What volume of hydrogen at STP is required to produce 25 g of ammonia?

N₂(g) + 3H₂(g) → 2NH₃(g)

• 33 L

• 1.1 L

• 49 L

• 25 L

Tags

NGSS.HS-PS1-7