Chemistry Practice Problems Enthalpy of Formation Practice Problems Solution: What is the standard enthalpy of reaction ΔH orxn ...

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Solution: What is the standard enthalpy of reaction ΔH orxn for the following reaction using the standard enthalpies of formation provided ? SiCl4(l) + 2H2(g) + O2(g) → SiO2 (s) + 4HCl(g)              ΔHorxn = ? ΔH°f(SiCl4) = -640.1 kJ/mol   ΔH°f(HCl) = -92.3 kJ/mol ΔH°f(SiO2) = -910.9 kJ/mol

Problem

What is the standard enthalpy of reaction ΔH orxn for the following reaction using the standard enthalpies of formation provided ?

SiCl4(l) + 2H2(g) + O2(g) → SiO2 (s) + 4HCl(g)              ΔHorxn = ?

ΔH°f(SiCl4) = -640.1 kJ/mol  
ΔH°f(HCl) = -92.3 kJ/mol
ΔH°f(SiO2) = -910.9 kJ/mol