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How much heat is necessary to change 30 g of water at 40°C into water at 80°C?

 

How much heat is necessary to change 30 g of water at 50°C into steam at 100°C?

 Mar 5, 2018
 #1
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30 g  x  1 cal/gm-c  x  (80-40) c   x 4.184 j/cal = 5020.8 j

 

 

Second one

    .....first you have to warm the water....then convert it to steam

30 g x 4.186 j/gm-c x (100-50 c)    +   30 gm x 2260 j/gm   =  74079 j

 Mar 6, 2018

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