Diketahui: a. Hitunglah ! b.Berapa kalor yang dilepaskan jika 10 gram C 3 H 8 dibakar sempurna? ( A r C = 12; H = 1)

Question

Diketahui:

$\style{font-size:14px}{\mathit\triangle H{\mathit\textdegree}_f\mathit\;{\mathrm H}_2\mathrm O(l)=\;-285,5\;\mathrm{kJ}\;\mathrm{mol}^{-1}\;\\\mathit\triangle H{\mathit\textdegree}_f\;{\mathrm{CO}}_2(g)=\;-393,5\;\mathrm{kJ}\;\mathrm{mol}^{-1}\;\\\mathit\triangle H{\mathit\textdegree}_{\mathit f}\;{\mathrm C}_3{\mathrm H}_8\;(\mathrm g)=\;-103\;\mathrm{kJ}\;\mathrm{mol}^{-1}\;}$

a. Hitunglah $\style{font-size:14px}{\mathit\triangle}{\style{font-size:14px}H}_{\mathit c}\style{font-size:14px}\;{\style{font-size:14px}{\mathrm C}}_\style{font-size:14px}3{\style{font-size:14px}{\mathrm H}}_\style{font-size:14px}8\style{font-size:14px}\;$ !

b. Berapa kalor yang dilepaskan jika 10 gram $C_{3} H_{8}$ dibakar sempurna? ( $A_{r}$ C = 12; H = 1)