a 42 piece of ice at 0.0 C is added to a sample of water at 8.0 C. all of the ice melts and the temperature of the water decreases to 0.0 C. how many grams of water were in the sample.

Answer 1

melt ice + move ice from zero to final T + cool H2O from 8 to final T = 0

(mass ice x heat fusion) + (mass melted ice x specific heat H2O x (Tfinal-Tinitial) + (mass H2O x speicif heat H2O x (Tfinal-Tinitial) = 0
Solve for mass H2O.
I obtained 420 g but you should confirm that value.