1. Solar energy can heat cold water for household hot water tanks. What quantity

Question

1. Solar energy can heat cold water for household hot water tanks. What quantity of heat is obtained from solar energy if 150kg of water is heated from 15 degrees celsius to 50 degrees celsius? ( Please show all the steps)

2. Identify each of the following processes as exothermic or endothermic;

a) The combustion of propane in a barbecue tank.

b) Ag2O + heat ----> 2Ag + 1/2 O2  

c) As solid NaNO3 dissolves in water at 25C, the temperature changes to 22C  

d) When calcium is added to water at 22C, the temperatue changes to 27C

e) Mg + 1/2 O2 ----> MgO + bright light  

f) 2H2 +O2 ----> 2H2O enthalpy change= -571.0kJ  

g) N2 +O2----> 2NO enthalpy change= 180.8kJ    

Explanation / Answer

specific heat of water is 1 calorie/gram

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