Question

A 3.00 g sample of KClO₃ is decomposed, and the oxygen produced is collected. What is the volume of oxygen gas at standard temperature and pressure (STP) produced by the complete decomposition of the KClO₃?

A) 0.224 L
B) 0.448 L
C) 0.672 L
D) 0.896 L

Answer 1

To calculate the volume of oxygen gas produced by the decomposition of KClO₃, use stoichiometry and the ideal gas law. The answer is 0.448 L of oxygen gas.

Step-by-step explanation:

To calculate the volume of oxygen gas produced by the decomposition of KClO₃, we need to use stoichiometry. First, calculate the moles of KClO₃ by dividing the mass by the molar mass. Next, use the balanced equation to find the mole ratio between KClO₃ and O₂. Finally, use the ideal gas law to calculate the volume of O₂ at STP. The answer is 0.448 L of oxygen gas.