A sample of iron absorbs 81.0 J of heat, upon which the temperature of the sample increases from 19.7 °C to 28.2 °C. If the specific heat of iron is 0.450 J/g-K, what is the mass (in grams)of the sample?

Question

Quizplus · Accepted Answer

The formula to calculate the mass is: q = m * c * ΔT. Rearranging for m gives m = q / (c * ΔT). Here, q = 81.0 J, c = 0.450 J/g-K, and ΔT = 28.2 °C - 19.7 °C = 8.5 K. So, m = 81.0 J / (0.450 J/g-K * 8.5 K) = 21.2 g.

A Sample of Iron Absorbs 81