The specific heat of water is ${1 c a l}^{- 1} g^{- 1} C^{- 1}$ . Its value in S.I units is approximately

1

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4.2

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420

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4200

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Solution

The correct option is D $4200$
The specific heat of water in CGS unit is given, $1 c a l / g^{o} C$
We know that $1 c a l = 4.2 j o u l e (J)$ and $1 g = 0.001 k g$
So $1 c a l / g^{o} C = \frac{4.2 J}{0.001 k g^{o} C} = 4200 J / k g^{o} C$

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Similar questions

1 c a l g^{- 1}^{o} C^{- 1}

The specific heat capacity of water is :

(a) 4200 J k $g^{- 1} K^{- 1}$ (b) 420 J k $g^{- 1} K^{- 1}$

Calculate the amount of heat released when 5.0 g of water at 20 °C is changed into ice at 0 °C.

Specific heat capacity of water = 4.2J g^-1 °C^-1, Specific latent heat of fusion of ice = 336 J g^-1.

10^{o} C

(s p e c i f i c h e a t o f c o p p e r = 420 J k g^{- 1} K^{- 1}, s p e c i f i c h e a t o f w a t e r = 4200 J k g^{- 1} K^{- 1})

50

10^{o}

10

= 420

k g^{- 1} K^{- 1}

= 4200

k g^{- 1} K^{- 1}

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