Question #87165
During the combustion of 2.8g C, the temperature of 1200g of water in a calorimeter rose from 18.4 degrees Celsius to 55.7 degrees Celsius. Determine the molar heat for this reaction
Expert's answer
The formula of quantity of heat, q, is equal to the mass of substance, m, multiplied with the specific heat and the change in temperature, ΔT .
C(H2O) = 4.186 J/g·°C
q = C*m*ΔT = 4.186 J/g·°C*1200g*(55.7°C – 18.4°C) = 187365.36 J = 187.365 kJ
n(C) = m/M = 2.8g/12g/mol = 0.233 mol
Molar heat = 187.365kJ/0.233mol = 804.142 kJ/mol
