(Solved): 7. Calculate the \( \Delta H^{\circ}{ }_{x n} \) for the combustion of methane using the given \( \ ...

7. Calculate the \( \Delta H^{\circ}{ }_{x n} \) for the combustion of methane using the given \( \Delta H^{\circ} \) f. \( \Delta \mathrm{H}^{\circ} \), , methane \( (g)=-74.60 \mathrm{~kJ} / \mathrm{mol} \) \( \Delta \mathrm{H}^{\circ} \mathrm{f} \), water \( (\mathrm{I})=-285.8 \mathrm{~kJ} / \mathrm{mol} \) \( \Delta \mathrm{H}^{\circ} \mathrm{f} \), carbon dioxide \( (\mathrm{g})=-393.5 \mathrm{~kJ} / \mathrm{mol} \) a. \( -1.04 \times 10^{+3} \mathrm{~kJ} / \mathrm{mol} \) b. \( -890.5 \mathrm{~kJ} / \mathrm{mol} \) c. \( 890.5 \mathrm{~kJ} / \mathrm{mol} \) 8. The pressure of a gas in a container is \( 1.85 \mathrm{~atm} \) and occupies a volume of \( 12.5 \mathrm{~L} \). If the original volume is reduced by half at constant temperature, what would happen to the pressure? a. the pressure would double b. the pressure would reduce by half c. the pressure would remain the same