Gas Stoichiometry Problem Solving Techniques

The video tutorial explains how to solve a chemistry problem involving the decomposition of sodium aide to determine the volume of nitrogen gas produced. It outlines a step-by-step approach: converting grams to moles, using stoichiometry to find moles of nitrogen, and applying the ideal gas law to calculate the volume of nitrogen under non-STP conditions. The tutorial emphasizes understanding the process and applying it to similar problems.

What is the first step in solving the problem of sodium azide decomposition?

• Using the ideal gas law immediately

• Calculating the volume of nitrogen gas directly

• Converting grams of sodium azide to moles

• Determining the temperature in Kelvin

What is the molar mass of sodium azide used in the conversion?

• 65 g/mol

• 23 g/mol

• 44 g/mol

• 84 g/mol

How is the molar mass of sodium azide calculated?

• Estimating based on the gas laws

• Multiplying the atomic mass of sodium by three

• Adding the mass of sodium to three times the mass of nitrogen

• Using the density of sodium azide

What conversion factor is used to convert grams of sodium azide to moles?

• 1 mole/84 g

• 84 g/1 mole

• 1 mole/65 g

• 65 g/1 mole

How many moles of sodium azide are converted into moles of nitrogen gas?

• 3.00 moles

• 1.31 moles

• 2.62 moles

• 0.65 moles

What is the ratio of moles of sodium azide to moles of nitrogen gas in the reaction?

• 1 mole of NaN3 to 2 moles of N2

• 3 moles of NaN3 to 2 moles of N2

• 1 mole of NaN3 to 1 mole of N2

• 2 moles of NaN3 to 3 moles of N2

What is the final volume of nitrogen gas produced?

• 18.0 L

• 30.0 L

• 22.4 L

• 24.5 L

Which law is used to calculate the volume of nitrogen gas?

• Avogadro's Law

• Charles's Law

• Boyle's Law

• Ideal Gas Law

What conditions prevent the use of the 22.4 L rule for gas volume?

• Only above 100°C

• Not at STP

• At STP

• Only at room temperature

Why can't the 22.4 L rule be applied in this scenario?

• Because nitrogen gas does not follow the ideal gas law

• Because sodium azide is a solid

• Because the volume of gas is always less than 22.4 L

• Because the conditions are not at STP