Answer to Question #174598 in General Chemistry for Hamza

Question

22.40g of an unknown sample, with a molar mass of 49.70g/mol, reacts with excess reagents inside a simple calorimeter.

The outside of the calorimeter is made of an aluminum cup with a mass of 99.1g. There is 119g of water inside the calorimeter. The temperature of the entire calorimeter increases from 20.0°C to 22.6°C.

What is the molar enthalpy of reaction, in kJ/mol, with respect to the unknown?

Answer 1

Q = mass x specific heat capacity x temp change

Q= 22.4 × 2.6 = 58.24