Oxygen Gas Is Formed by the Decomposition of Potassium Chlorate $\rightarrow$

question 144

Multiple Choice

Oxygen gas is formed by the decomposition of potassium chlorate at high temperatures according to the reaction 2 KClO₃ (s) $\rightarrow$ 2 KCl(s) +3 O₂ (g) .Suppose 1.23 g KClO₃ is placed in a container connected to an open-end mercury manometer on a day when atmospheric pressure is 1.00 atm.Once the reaction is complete, the height of the mercury column in the U-tube on the side of the reaction container rises by 172 mmHg.What is the pressure of O₂ gas produced by the reaction?

• A)1348 torr
• B)0.774 atm
• C)22.9 kPa
• D)0.559 bar
• E)36.7 in Hg

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