The combustion of 0.570 g of benzoic acid (δhcomb = 3,228 kj/mol; mw = 122.12 g/mol) in a bomb calorimeter increased the temperature of the calorimeter by 2.053naughtc. the chamber was then emptied and recharged with 2.900 g of glucose (mw = 180.16 g/mol) and excess oxygen. how much did the temperature change from the combustion of the glucose? δhcomb for glucose is 2,780 kj/mol.

The temperature change from the combustion of the glucose is 6.097°C.

Explanation:

Benzoic acid;

Enthaply of combustion of benzoic acid = 3,228 kJ/mol

Mass of benzoic acid = 0.570 g

Moles of benzoic acid =

Energy released by 0.004667 moles of benzoic acid on combustion:

Heat capacity of the calorimeter = C

Change in temperature of the calorimeter = ΔT = 2.053°C

Glucose:

Enthaply of combustion of glucose= 2,780 kJ/mol.

Mass of glucose=2.900 g

Moles of glucose =

Energy released by the 0.016097 moles of calorimeter  combustion:

Heat capacity of the calorimeter = C (calculated above)

Change in temperature of the calorimeter on combustion of glucose = ΔT'

The temperature change from the combustion of the glucose is 6.097°C.

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