Study Question

$1.$ The following data is given

P$4($s$)->4$ P $($g$)\backslash$Delta H $=300\mathrm{.}8$ kcal

H$2($g$)->2$ H $($g$)\backslash$Delta H $=104\mathrm{.}0$ kcal

PH$3($g$)->$ P $($g$)+3$ H $($g$)\backslash$Delta H $=223\mathrm{.}0$ kcal

Calculate the molar heat of formation for PH$3($g$).$

$2.$ Define briefly

a$.$ Heat of formation

b$.$ Heat of reaction

c$.$ Heat capacity of a calorimeter