Determine the enthalpy change for the following reaction:

$Cr(s)+\frac{3}{4}{O}_2(g)\frac{1}{2}C{r}_2{O}_3(g)$

Chrome green is formed by the following thermochemical reaction of iron with oxygen from the air:

$2Cr(s)+\frac{3}{2}{O}_2(g)C{r}_2{O}_3(g){}_{r}H=-1140kJ*mo{l}^{-1}$

Express your answer to four significant figures and include the approprlate units.

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Part B

Determine the enthalpy change for the following reaction:

Express your answer to four significant figures and Include the appropriate units.

$2C{r}_2{O}_3(g)4Cr(s)+3O_2(g)$

$2C{r}_2{O}_3(g)4Cr(s)+3O_2(g)$

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Part C

Determine the enthalpy change for the following reaction:

Express your answer to four significant figures and Include the appropriate units.

$\frac{4}{3}Cr(s)+O_2(g)\frac{2}{3}C{r}_2{O}_3(g)$