White phosphorus,

P_(4)

, ignites in air to produce heat, light, and

P_(4)O_(10)

according to the following reaction.\

P_(4)(s)+5O_(2)(g)longrightarrowP_(4)O_(10)(s)

\ If

67.2g

of

P_(4)

is burned,

1620kJ

of energy is evolved. What is the molar enthalpy of combustion of

P_(4)

if the process was carried out under constant pressure?

20. White phosphorus, P4, ignites in air to produce heat, light, and P4O10 according to the following reaction P4(s)+5O2(g)P4O10(s) If 67.2g of P4 is burned, 1620kJ of energy is evolved. What is the molar enthalpy of combustion of P4 if the process was carried out under constant pressure