when 1g of anhydrous oxalic acid is burnt at 25 C,the amount of heat liberated is 2 835kJ Enthalpy change - Chemistry - Thermodynamics

Question

when 1g of anhydrous oxalic acid is burnt at 25°C,the amount of
heat liberated is 2 835kJ Enthalpy change for combustion is

J.mohamed Salman · Answer

As per definition, Heat of Combustion of a substance is the heat
liberated when 1 mole of the substance undergoes complete
combustion with oxygen at constant pressure

molar mass of H2C2O4 is 90 03 g mol−1 (As per Wikipedia)

1g of anhydrous oxalic acid is burnt at 25 °C , the amount of
heat liberated is 2 835 kJ
then when 90 03 g of anhydrous oxalic acid is burnt at 25 °C ,
the amount of heat liberated is 2 835*90 03= 255 23 kJ

So heat of Combustion is 255 23 kJ/mole

when 1g of anhydrous oxalic acid is burnt at 25°C,the amount of heat liberated is 2.835kJ.Enthalpy change for combustion is