A molten metal of mass $150 g$ is kept at its melting point $800^{\circ} C$ . If the specific heat capacity of metal is $200 J k g^{- 1} K^{- 1}$ , how much additional heat energy will the metal give out in cooling to $- 50^{\circ} C$ ?

2.55 J

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25.5 J

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255 J

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25, 500 J

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Solution

The correct option is D $25, 500 J$
Heat released $Q = m \times c \times Δ T$
$c = 200 J K g^{- 1} K^{- 1}$
or, $0.2 J g^{- 1} K^{- 1}$
$Q = 150 \times 0.2 \times (800 - (- 50))$
$Q = 25500 J$

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A molten metal of mass 150 g is kept at its melting point 800∘C. If the specific heat capacity of metal is 200Jkg−1K−1, how much additional heat energy will the metal give out in cooling to −50∘C ?

The correct option is D 25,500JHeat released Q=m×c×ΔTc=200JKg−1K−1 or, 0.2Jg−1K−1Q=150×0.2×(800−(−50))Q=25500J

A molten metal of mass $150 g$ is kept at its melting point $800^{\circ} C$ . If the specific heat capacity of metal is $200 J k g^{- 1} K^{- 1}$ , how much additional heat energy will the metal give out in cooling to $- 50^{\circ} C$ ?

The correct option is D $25, 500 J$
Heat released $Q = m \times c \times Δ T$
$c = 200 J K g^{- 1} K^{- 1}$
or, $0.2 J g^{- 1} K^{- 1}$
$Q = 150 \times 0.2 \times (800 - (- 50))$
$Q = 25500 J$