Question

when a 7.00 g sample of rbbr is dissolved in water in a calorimeter that has a total heat capacity of 2.65 kj⋅k−1, the temperature decreases by 0.350 k. calculate the molar heat of solution of rbbr.

Answer 1

The molar heat of solution is  -23.2 kJ/mol.

What is the molar heat?

The molar heat is the heat that is evolved when one mole of the rubidium bromide is dissolved in water under standard conditions. We first have to find number of moles of the solution. When we dissolve the solid in solution heat is absorbed or evolved as seen above.

Number of moles =  7.00 g/165 g/mol = 0.04 moles

Given that;

H = cθ

H = heat absorbed or evolved

θ = temperature change

c = heat capacity

H = -(2.65 *  0.350)/0.04

H = -23.2 kJ/mol

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