How many grams of KCl(s)are produced from the thermal decomposition of KClO₃(s)which produces 100.0 mL of O₂(g)at 25°C and 1.00 atm pressure according to the chemical equation shown below? 2 KClO₃(s)→ 2 KCl(s)+ 3 O₂(g)? A) 0.203 g B) 0.305 g C) 0.334 g D) 0.608 g

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Quizplus · Accepted Answer

The balanced chemical equation shows that 2 moles of KClO3 produce 3 moles of O2. Therefore, 100.0 mL of O2 at 25°C and 1.00 atm pressure corresponds to 100.0 mL / (22.4 L/mol) * (1 mol / 3 mol) = 0.0139 mol of O2. Since 2 moles of KClO3 produce 2 moles of KCl, 0.0139 mol of O2 corresponds to 0.0139 mol of KCl. The molar mass of KCl is 74.55 g/mol, so 0.0139 mol of KCl corresponds to 0.0139 mol * 74.55 g/mol = 1.03 g of KCl.

How Many Grams of KCl(s)are Produced from the Thermal Decomposition