The formed in the reaction value of Alt for the reaction bel

The formed in the reaction? value of Alt for the reaction below is -126 kJ. How much heat (in kJ) is released when 2.00 mol of NaOH is 2Na202 (s) + 2H20 (1)-NaOH (s) + O2 (g) A) 7.8 B) 252 C)-126 D) 63 E) 3.9

Solution

when 4 moles of NaOH is formed the amount of energy released is 126 KJ

Let x be the amount of energy released when 2 moles of NaOH is formed

4 moles of NaOH gives------------------------->126 KJ

2 moles of NaOH gives--------------------------> x

cross multiply 4*x=2*126

x=(2*126)/4 = 63 KJ