A 47.35 g mass of copper is heated from 20 degrees celsius to 85 degrees celsius. How many joules were added to accomplish this?

1185.0 J.

Explanation:

The amount of heat needed to accomplish this process can be calculated using the formula:

Q = m. C.ΔT, where,

Q is the amount of heat needed,

m is the mass of the copper (m = 47.35 g),

C is the specific heat of Cu (C = 0.385 J/g.°C),

ΔT is the temperature difference (the final temperature - the initial temperature (ΔT = 85.0 - 20.0 = 65.0 °C).

∴ The amount of heat needed Q = m. C.ΔT = (47.35 g) (0.385 J/g.°C) (65.0 °C) = 1184.933 J ≅ 1185.0 J.