Use the Refereaces to access impertant valoes neded foe this qurtioe Sirer heat

Question

Use the Refereaces to access impertant valoes neded foe this qurtioe Sirer heat foods. In an experiment, a0.7221gsample of para-benzoquinose (CoHO) is baned completaly in a bomb calorimeter. The calorimeter is surrounded by 1.333 10g of water. Daring the comsbustionre increases from 28.24 to 3493 C. The heat capacity of water is 4.18r c The beat capacity of the calorimeter was determined in a previous experiment to be 973.0c Assuening that no energy is lost to the surroundings, calculate the molar heat of combustion of based on these data Molar Heat of Combustion kJ/mol Insdlated Sanple BuingsSterel outside dish chambar samplebomb This is group attempt 2 of 10

Explanation / Answer

Let molar heat of combustion = H kJ/mol

Energy balance

Heat released by combustion reaction = Heat absorbed by water + Heat absorbed by calorimeter

Heat of reaction x mass of sample = mass of water x Cp x (T2-T1) + C x (T2-T1)

H kJ/mol x 1mol/108g x 0.7221g = 1.333 x 10^3 g x 1kg/1000g x 4.184 kJ/kg-K x (30.93 - 28.24)K + 0.973 kJ/K x (30.93 - 28.24)K

H x 0.0066861 = 15.00286 + 2.61737

H = 2635.35 kJ/mol

Since the heat is released so "negative" sign is considered.

H = - 2635.35 kJ/mol

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