Question #1a163
1 Answer
Explanation:
We know that heat gained/lost is given by
where
In the given problem heat is given to water to increase its temperature from

Water heated from
#22^@"C"# to#100^@"C"#
Using the expression and taking specific heat of water as 1.
#DeltaQ=mst#
#DeltaQ_1=250xx1xx(10022)=19500cal# 
Heat gained by boiling water to change into vapours at the same temperature i.e.,
#100^@"C"# is given by#DeltaQ_2=mL# , where Latent heat of vaporization of water is#540calg^1# .
#:. DeltaQ_2=250xx540=135000cal#
Total heat required