Question

How much heat (in kJ) is released when 1.65 mol NaOH(s) is dissolved in water? (The molar heat of solution of NaOH is −445.1 kJ/mol.)

A) -734.2 kJ
B) -584.8 kJ
C) -367.0 kJ
D) -722.5 kJ

Answer 1

The heat released when 1.65 mol NaOH(s) is dissolved in water is calculated by multiplying the molar heat of solution (-445.1 kJ/mol) by the number of moles (1.65 mol), which equals -734.2 kJ. The correct answer is A) -734.2 kJ.

Step-by-step explanation:

To calculate the heat released when 1.65 mol of NaOH(s) is dissolved in water, we use the given molar heat of solution. The molar heat of solution for NaOH is −445.1 kJ/mol. By multiplying the molar heat of solution by the number of moles, we can find the total heat released:

Heat released = (molar heat of solution) × (number of moles)

Heat released = (−445.1 kJ/mol) × (1.65 mol) = −734.2 kJ

Therefore, the correct option is A) −734.2 kJ