Chemistry, 13.01.2020 21:31 camilacarrielh15
Hydrogen and methanol have both been proposed as alternatives to hydrocarbon fuels. write balanced reactions for the complete combustion of hydrogen. use standard enthalpies of formation to calculate the amount of heat released per kilogram of the fuel.
Answers: 1
![\Delta H^o_{rxn}=\sum [n\times \Delta H^o_f_{(product)}]-\sum [n\times \Delta H^o_f_{(reactant)}]](/tpl/images/0453/3092/72c39.png)
![\Delta H^o_{rxn}=[(1\times \Delta H^o_f_{(H_2O(l))})]-[(1\times \Delta H^o_f_{(H_2(g))})+(\frac{1}{2}\times \Delta H^o_f_{(O_2(g))})]](/tpl/images/0453/3092/8b164.png)
![\Delta H^o_{rxn}=[(1\times (-285.8))]-[(1\times 0)+(\frac{1}{2}\times 0)]=-285.8kJ/mol](/tpl/images/0453/3092/fecc9.png)
![\Delta H^o_{rxn}=[(2\times \Delta H^o_f_{(CO_2(g))})+(4\times \Delta H^o_f_{(H_2O(l))})]-[(2\times \Delta H^o_f_{(CH_3OH(l))})+(3\times \Delta H^o_f_{(O_2(g))})]](/tpl/images/0453/3092/d9b43.png)
![\Delta H^o_{rxn}=[(2\times (-393.51))+(4\times (-285.5))]-[(2\times (-238.42))+(3\times 0)]=-1452.18kJ/mol](/tpl/images/0453/3092/3c34e.png)
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