How can this Chemistry problem be solved?

Question

Calculate the kilojoules needed to heat 175 g of copper from 82. ∘F to 347 ∘F. The specific heat of Copper is 0.0920 cal/g °C and 0.385 J/ g °C.

Give your answer in the correct number of significant figures

Answer 1

Use the equation:

where Q is the heat in joules, m is the mass in grams, C_p is the specific heat in J/(g•°C), and ΔT is the change in temperature in °C

First convert the temperature into °C:

°C = (°F - 32)(5/9)

So 82°F = (82 - 32)(5/9) = 27.778 °C

And 347°F = (347 - 32)(5/9) = 175°C

Q = (175)(0.385)(175 - 27.778) = 9919 joules

To get kilojoules, divide by 1000 = 9.92 Kj