![\Delta H=[n\times H_f{products}]-[n\times H_f{reactants}]](/tpl/images/1194/2804/bbfa8.png)
![\Delta H=[4\times H_f_{CO_2}+5\times H_f_{H_2O}]-[1\times H_f_{C_4H_{10}}+\frac{13}{2}\times H_f_{O_2}]](/tpl/images/1194/2804/8d048.png)
![-2877=[(4\times -393)+(5\times -286)]-[1\times H_f_{C_4H_{10}}+\frac{13}{2}\times 0]](/tpl/images/1194/2804/d45b4.png)
Can someone help me? It needs to have a diagram that has arrows.
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