AP Chemistry
4.5 Stoichiometry
A student heats a \(0.245\ \text{g}\) sample of \(\text{KClO}_3\text{(s)}\), with a molar mass of \(122.5\ \text{g/mol}\), in the presence of a catalyst. The \(\text{O}_2\text{(g)}\) produced is collected over water according to the reaction
\[ 2\text{KClO}_3\text{(s)}\rightarrow 2\text{KCl(s)}+3\text{O}_2\text{(g)} \]
The gas is collected at \(300\ \text{K}\), when the barometric pressure is \(0.855\ \text{atm}\) and the vapor pressure of water is \(0.0350\ \text{atm}\). For gas collected over water, \(P_{\text{O}_2}=P_{\text{barometric}}-P_{\text{H}_2\text{O}}\). Assume the reaction goes to completion and use \(R=0.0820\ \text{L atm mol}^{-1}\text{K}^{-1}\). Which of the following is closest to the volume of gas collected?
\[ 2\text{KClO}_3\text{(s)}\rightarrow 2\text{KCl(s)}+3\text{O}_2\text{(g)} \]
The gas is collected at \(300\ \text{K}\), when the barometric pressure is \(0.855\ \text{atm}\) and the vapor pressure of water is \(0.0350\ \text{atm}\). For gas collected over water, \(P_{\text{O}_2}=P_{\text{barometric}}-P_{\text{H}_2\text{O}}\). Assume the reaction goes to completion and use \(R=0.0820\ \text{L atm mol}^{-1}\text{K}^{-1}\). Which of the following is closest to the volume of gas collected?
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