Potassium chlorate melts and then decomposes at high temperature to form potassi

Question

Potassium chlorate melts and then decomposes at high temperature to form potassium chloride and oxygen gas (equation shown below). 4. 2KCIO3 (I) 2KCI (s) + 302 (g) Suppose that a 0.550 g sample of potassium chlorate produces oxygen gas that is collected using the water displacement method you performed in the laboratory. Under the conditions of the experiment the barometric pressure is 1.03 atm and the water has a temperature of 20°C. Assume the vapor pressure of water is 18.6 torr at 20°C. What is the volume in milliliters of oxygen gas produced? Be sure to include stoichiometry dimensional analysis and consideration of significant figures in your work. Also explicitly show any algebraic steps you use.

Explanation / Answer

no of mol of KClO3 reacted = 0.55/122.55 = 0.0045 mol

no of mol of O2 gas liberated(n) = 0.0045*3/2 = 0.00675 mol

volume of gas = nRT/P

pressure of o2 gas = 1.03*760 - 18.6 = 764.2 torr

             V = 0.00675*0.0821*(293.15)/(764.2/760)

              = 0.1615 L

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