Question

Approximately how many joules of heat are needed to raise the temperature of a 4.0-gram sample of water to 8.0C?

that is all of the information that was provided

Answer 1

q = mass H2O x specific heat H2O x (Tfinal-Tinitial).
4
q = 4.0g x 4.184 J/g*C x (8-Tinitial).
Can't do it without Tinitial.
That 8.0 C may be to raise the T BT 8.0 C. in which case Tfinal-Tinitial = 8.0

Answer 2

16.8