The specific heat of water is #(4.1868" Joules")/("g "^@"C)#. The change in temperature is #80^@"C"#. Please see the explanation for the factor-label calculation.
Explanation:
#(210 cancel("g of H"_2"O"))/1(4.1868" Joules")/(cancel("g "^@"C of H"_2"O"))(80cancel(@C))/1(1/(105" s")) ~~ 670" Joules"/s #