SCH$4$U Assignment $10$

Name

Hess's Law $($show all your work$)$

$(1)$ Find $H$ for $2C{O}_2(g)+H_{2}O(g)C_2{H}_2(g)+\frac{5}{2}{O}_2(g)$ given the reactions:

$C_2{H}_2(g)+2H_2(g)C_2{H}_6(g),H=-94\mathrm{.}5kJ$

$H_{2}O(g)H_2(g)+\frac{1}{2}{O}_2(g),H=71\mathrm{.}2kJ$

$C_2{H}_6(g)+7^7{O}_2(g)2C{O}_2(g)+3H_{2}O(g),H=-283kJ$

$(2)$ Find $H$ for $H_{2}S{O}_4(l)S{O}_3(g)+H_{2}O(g)$ given the reactions:

$H_{2}S(g)+2O_2(g)H_{2}S{O}_4(l)$

$H_{2}S(g)+2O_2(g)S{O}_3(g)+H_{2}O(l)$

$H_{2}O(l)H_{2}O(g)$

$H=-235\mathrm{.}5kJ$

$H=-207kJ$

$H=44kJ$