HELP VERY MUCH NEEDED!

Question

How much heat does it take to raise the temperature of 5.0 kg of plastic from 15C to 75C? The specific heat of plastic is 2.60 kJ/(kgC).
Use Q = mc(Tf - Ti).
A. 980 kJ

B. 196 kJ

 

C. 780 kJ

D. 300 kJ

Answer 1

m = 5.0 kg

c = 2.60 kJ/kgC = 2600 J/kgC

(Tf - Ti) = 75 - 15 = 60 C

 

Q = mc(Tf - Ti) = 5 * 2600 * 60 = 780,000 J = 780 kJ

 

Answer: Option C.