What is the standard enthalpy of formation of $PCl_{3 (g)}$ in $kJ mol^{? 1}$ ? (Note that $P_{4 (s)}$ is the standard state of phosphorus) $P_{4 (s)} + 10 Cl_{2 (g)} ? 4 PCl_{5 (s)} PCl_{3 (g)} + Cl_{2 (g)} ? PCl_{5 (s)} ? H^{?} = ? 1774.0 kJ ? H^{?} = ? 156.5 kJ$ $+ 1517.5 + 287.0 ? 287.0 + 474.0 ? 1517.5$

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What is the standard enthalpy of formation of

PCl_{3 (g)}

in

kJ mol^{? 1}

? (Note that

P_{4 (s)}

is the standard state of phosphorus)

P_{4 (s)} + 10 Cl_{2 (g)} ? 4 PCl_{5 (s)} PCl_{3 (g)} + Cl_{2 (g)} ? PCl_{5 (s)} ? H^{?} = ? 1774.0 kJ ? H^{?} = ? 156.5 kJ

+ 1517.5 + 287.0 ? 287.0 + 474.0 ? 1517.5

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