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Molar and Specific Heat Capacity

Calculate the...

Question

Calculate the heat needed to raise the temperature of $20 g$ iron from $25^{o} C$ to $500^{o} C$ , if specific heat capacity of iron is $0.45 J K^{- 1}$ $g^{- 1}$ .

A

6732 J

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B

225 J

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C

15.66 J

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D

2250 J

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Solution

The correct option is A $6732 J$
Formula for specific heat-
$Q = m C Δ T$
$Q = .45 \times 20 \times (475 + 273) = 6732 J$

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