In the reaction shown below, 699 kcal of heat are liberated when2.10g of AgNO 3
ID: 687980 • Letter: I
Question
In the reaction shown below, 699 kcal of heat are liberated when2.10g of AgNO3 reacts with HCl: AgNO3(aq) +HCl(aq) ---> AgCl(s) + HNO3(aq) what is the heat ofreaction in terms of kcal/mole of AgNO3?Explanation / Answer
First we find out what the molecule weighs by looking at theperiodic table. Ag = 106.4 g/mole N = 14 g/mole O = 16 g/mole ----> AgNO3 = 106.4+14+16*3 = 168.4 g/mole 2.1 g / (168.4 g/mole) = 0.01247 mole So in 2.1 g you have 0.01247 mole of AgNO3. 1/0.01247 = how many times you have to take 2.1 g to get 1 mole ofAgNO3 = 80.2 This means that there is 80.2 times more heat from one mole ofAgNO3 than from 2.1 g AgNO3. 699*80.2 = 56100 kcal / mole