Question

Be sure to answer all parts. A 0.4275 g sample of solid magnesium is burned in a constant volume bomb calorimeter that has a heat capacity of 3024 J/°C. The temperature increases by 3.499°C. (a) Calculate the heat associated with the burning Mg in kJ/g. kJ/g (b) Calculate the heat associated with the burning of Mg in kJ/mol. kJ/mol

Answer 1

Solo Assuming that no heat is lost to the Surroundings, the heat change of the reaction is the negative of the heat change of the calorimeter. arxo = -acal mohan = -c cal at Hele, mis mass of sample, DHxD heat of reaction, ccal is heat capacity of Calorimeter & ST is change in temperature. Now calculate wine as shown below Vcal = ccal at = (30241 ) ( 3.499°c) = 10580.976 J = 10.58 KI substitute the values in quation @ & get, MD Hrxo = -c cal AT 0.42759x Di Rp = -10.56 kJ AHYX = -10.58K5 5-24748 kJ 0.42759 Blasen ²-24.75 KIJg

the heat given off by the burning mg KIS is 24.75 KT) ase molar mass of my to get the value In Kilmol as shown below the molas mass of mg is 24.31 g DHyxD = -24.75 kJ x 24.31 93 moi = -601.67 Ks mol the heat given oft by the burning in kJ/mol is 1601.67 KT mg moi