`a)`

`C_3H_8+5O_2` $\xrightarrow{t^o}$ `3CO_2+4H_2O(1)`

`C_4H_{10}+{13}/{2}O_2` $\xrightarrow{t^o}$ `4CO_2+5H_2O(2)`

`\Delta_r H_{298}^0(1)=3.(-393,5)+4.(-241,8)-(-103,9)=-2043,8(kJ)`

`\Delta_r H_{298}^0(2)=4.(-393,5)+5.(-241,8)-(-126,2)=-2656,8(kJ)`

`b)`

`m_{gas}=86,7.10^{6}.0,547=47,42.10^{6}(g)`

Giả sử trong gas; `n_{C_3H_8}=n_{C_4H_{10}}`

`->n_{C_3H_8}=n_{C_4H_{10}}={47,42.10^{6}}/{44+58}\approx 4,65.10^{5}(mol)`

`->` Lượng nhiệt tỏa ra khi đốt hết: `4,65.10^{5}.(2043,8+2656,8)\approx 2,2.10^{9}(kJ)`