Gas Laws and Chemical Reactions

This tutorial covers gas stoichiometry problems, focusing on calculations involving standard temperature and pressure (STP). It explains how to determine gas volumes using the ideal gas law and conversion factors. The video includes examples of reactions such as propane combustion, magnesium carbonate decomposition, and zinc reacting with hydrochloric acid. Each example demonstrates how to balance chemical equations, identify limiting reactants, and calculate the resulting gas volumes or pressures.

What is the standard temperature in Kelvin at STP?

• 0 K

• 273 K

• 100 K

• 373 K

How many liters does one mole of gas occupy at STP?

• 18.2 L

• 22.4 L

• 24.5 L

• 20.1 L

If you have 175 liters of oxygen gas at STP, how many moles of oxygen gas are present?

• 7.81 moles

• 6.25 moles

• 8.21 moles

• 9.00 moles

What is the balanced equation for the combustion of propane (C3H8) with oxygen?

• C3H8 + 5O2 → 3CO2 + 4H2O

• C3H8 + 4O2 → 3CO2 + 4H2O

• C3H8 + 6O2 → 3CO2 + 4H2O

• C3H8 + 5O2 → 4CO2 + 3H2O

What is the molar mass of magnesium carbonate (MgCO3)?

• 58.44 g/mol

• 100.935 g/mol

• 84.315 g/mol

• 44.01 g/mol

How many grams of magnesium nitride are consumed if 4.7 liters of ammonia gas is produced at 300 K and 1.6 atm?

• 15.42 g

• 20.00 g

• 10.50 g

• 18.75 g

What is the limiting reactant when 24 grams of zinc reacts with 245 mL of 1.75 M HCl?

• Zinc

• Hydrochloric acid

• Both are limiting

• Neither is limiting

What is the pressure of hydrogen gas collected in a 500 mL test tube at 25°C if produced from zinc and HCl?

• 10.49 atm

• 5.00 atm

• 12.00 atm

• 8.25 atm

How do you determine the limiting reactant in a chemical reaction?

• By comparing the initial masses of reactants

• By comparing the mole per coefficient ratio

• By comparing the initial volumes of reactants

• By comparing the final volumes of products

What is the balanced chemical equation for the reaction of zinc with hydrochloric acid?

• Zn + HCl → ZnCl2 + H2

• Zn + 2HCl → ZnCl2 + H2

• Zn + HCl → ZnCl + H2

• Zn + 2HCl → ZnCl2 + 2H2