Answer: 3510 J
Step-by-step explanation:
q = m x Cs x delta T
m = 28.0 g
Cs = 4.18 J/g x ⁰C
delta T = Final temperature - Initial temperature = 60.0⁰C - 30.0⁰C = 30.0⁰C
q = m x Cs x delta T
q = 28.0 g x (4.18 J/g x ⁰C) x 30.0⁰C = 3511.2 J
3510 J for the correct number of significant figures.
Grams and ⁰C cancel and you are left with Joules.