We have three pieces of materials and we are required to heat each of them from 1 5 ∘ C to 6 5 ∘ C . Choose the correct amount of heat required for each of the case. The specific heats, in cal/g ⋅ ∘ C

Question

We have three pieces of materials and we are required to heat each of them from 1 5 ∘ C to 6 5 ∘ C . Choose the correct amount of heat required for each of the case. The specific heats, in cal/g ⋅ ∘ C , for aluminium, Pyrex, and platinum are 0.21, 0.20, and 0.032, respectively.

TestHub · Accepted Answer

Use the heat-capacity relation: Q = m s Δ T Δ T = 5 0 ∘ C (A) 3 × 0.21 × 50 = 31.5 cal (B) 5 × 0.20 × 50 = 50 cal (C) 20 × 0.032 × 50 = 32 cal (D) 5 × 0.20 × 50 = 50 cal  = 5 cal

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