How many moles of methane gas molecules, CH₄, are in 12 liters of methane at STP?

What volume of hydrogen gas will be produced at STP by the reaction 67.3 g of magnesium with excess water according to the following reaction?

Mg + 2H₂O --> Mg(OH)₂ + H₂

How many moles of oxygen gas are in 50.0L of a sample at STP?

Zn +2HCI→ ZnCI₂ + H₂

If 0.30 mol Zn reacts with excess HCI, what volume of H₂ will be formed at STP?

At STP, how many liters of NH₃ are needed to react completely with 30.0L of NO?

4NH₃+6NO --> 5N₂ + 6H₂O

2 H₂O₂ --> 2 H₂O + O₂

72.4 g of hydrogen peroxide (H₂O₂) decomposes at 20 ⁰C and 1.25 atm.

How much volume of oxygen gas is produced?

4 Al + 3 O₂ --> 2 Al₂O₃

Given 2.55 g of Al at STP. Calculate the volume of oxygen required to react to completion.

2Al + 6HCl --> 2AlCl₃ + 3H₂

How many grams of aluminum is necessary to produce 11 L of hydrogen gas at STP?

Mg₃N₂ + 3H₂O ––> 3 MgO + 2NH₃

If 10.3 L of ammonia gas (NH₃) at STP is created, how many grams of water is required?

2Cu₂S + 3O₂ → 2Cu₂O + 2SO₂

This reaction uses 18.2 g of copper (I) sulfide. What volume of sulfur dioxide gas would be collected at 237°C and 10.7 atm?

2NaN₃ → 2Na + 3N₂

At what pressure(atm) is the nitrogen gas sample that is collected when 48.4 g of NaN₃ decomposes? The temperature of the gas is 25.0°C and the volume is 18.4 L.