What minimum heat is needed to bring 150 g of water at 50 ∘c to the boiling point and completely boil it away? the specific heat of water is 4190 j/(kg⋅k) and its heat of vaporization is 22.6×105 j/kg.

total heat needed 6.173*10^5 j

Explanation:

Heat needed to convert 50° to boiling point

where c is specific heat of water = 4190 j /kg K

= 0.250*4190*(100-50)

= 5237.5 j

Now heat required to convert water at 100 degree to vapour

=

= 0.250*22.6x10^5

= 5.65*10^5

total heat needed = 5237.5 +5.65*10^5 = 6.173*10^5 j

grav potential energy