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13. Calculate the number of joules of heat needed to change 50 grams of water by

50'C.

16.7 kJ

Explanation:

mass of water = 50 grams

change in temperature of water = 50⁰c

specific heat of fusion of water = 334 J/g

calculate the amount of heat needed/required

= mass of water * specific heat of fusion of water

= 50 grams * 334 J / g

= 16700 J

note : we use the specific heat of fusion of water because the temperature change given and the change is below 100⁰c hence the water is still in liquid form