Question

at 390 g of hot milk cools in a mug, it transfers 30,000 J of heat to the environment. What is the temperature change of the milk? The specific heat of milk is 3.9 J/g C. Show work please.

Answer 1

on my test i got "it decreases 20"

Answer 2

19.7°

Step-by-step explanation

The quantity of heat is given by:

Q = mcΔt

where m is the mass, c is the specific heat capacity

Q = mcΔt

30,000 = 390/1000 × (3.9×1000) Δt

30,000 = 0.39 × 3900 × Δt

= 1,521Δt

Δt = 30,000/1,521

= 19.7°