Gas Stoichiometry

Assume that 5.6 L H2 at STP reacts with excess CuO according to the following equation:

CuO (s) + H₂ (g) ---> Cu (aq) + H₂O (l)

How many moles of Cu are produced?

• 0.250 mol

• 2.50 mol

• 25.0 mol

• 25.00000 mol

Tags

NGSS.HS-PS1-7

You have 3.5 L of H₂ (g) at STP. How many moles of gas are there?

• 22.4 mol
• 22.4 L
• 0.16 mol
• 0.16 L

How many liters of NH₃ are needed to react completely with 30.0L of NO?

4NH₃(g) + 6NO (l)--> 5N₂ (g) + 6H₂O (l)

• 5.0 L

• 20.0 L

• 7.5 L

• 120.0 L

Tags

NGSS.HS-PS1-7

Solid aluminum react with HCl according to the following balanced equation at STP:

2Al (s) + 6HCl (aq) --> 2AlCl₃ (aq) + 3H₂ (g)

If 13.5 g of Al (s) reacts with excess HCl, how many liters of H₂ gas are generated?

• 15.2 L

• 16.8 L

• 12.5 L

• 14.8 L

Tags

NGSS.HS-PS1-7

What is the volume of 2 moles of gas at STP?

• 22.4 L
• 44.8 L
• 11.2 L
• 2 L

A sample of 3.0 grams of an ideal gas at 127°C and 1.0 atm has a volume of 1.5 L. What is the molar mass of this gas

• 7.3 g/mol

• 0.015 g/mol

• 0.00092 g/mol

• 66 g/mol

Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP?

• 9.0

• 14

• 27

• 56

Tags

NGSS.HS-PS1-7

If 0.20 mol of sulfur dioxide gas combines with 0.10 mol of oxygen gas to produce sulfur trioxide gas, what will the overall pressure in the flask be if the temperature is 25°C and the total volume is 4.0 L?

• 0.61 atm

• 1.2 atm

• 0.051 atm

• 0.10 atm

At approximately what temperature will 40. g of argon gas at 2.0 atm occupy a volume of 22.4 L?

• 1200 K

• 1100 K

• 550 K

• 280 K

A 1.00 L sample of a gas has a mass of 1.25 g at STP. What is the mass of 1.00 mol of this gas?

• 0.855 g

• 22.4 g

• 1.25 g

• 28.0 g