The temperature of a lead fishing weight rises from 26∘c to 38∘c as it absorbs 11.3 j of heat. what is the mass of the fishing weight in grams? (the specific heat capacity of lead is 0.128 j/g∘c.) express your answer in grams to two significant figures.

Question

Blanchard

Physics

7 December, 01:50

The temperature of a lead fishing weight rises from 26∘c to 38∘c as it absorbs 11.3 j of heat. what is the mass of the fishing weight in grams? (the specific heat capacity of lead is 0.128 j/g∘c.) express your answer in grams to two significant figures.

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Answers (1)

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Dharma · Answer 1

Given:

ΔT = 38 - 26 = 12°C, temperature change

Q = 11.3 J, heat input

c = 0.128 J / (g-°C), specific heat of lead

Let m = the mass of the lead.

Then

Q = m*c*ΔT

(m g) * (0.128 J / (g-°C)) * (12 °C) = 11.3 J

1.536m = 11.3

m = 7.357 g

Answer: 7.36 g (2 sig. figs)