Question

How many joules of heat energy is needed in raising the temperature of 250 g of water from 20°C to 55°C ?​

Answer 1

Given:

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m = 250 g

c = 4.2 Kg$^{–1}$

($\theta_{R}$)= (55 – 20)

= 35°C

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where ‘m’ means Mass of water

‘c’ means Specific heat capacity of water

and ($\theta_{R}$) means Rise in temperature.

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To find:

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Joules of heat energy needed in raising the temperature of 250 g of water from 20°C to 55°C.

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Solution:

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We know that,

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heat energy required to heat water will be mc$\theta_{R}$

= 250 × 4.2 × 35

= 36750 J.

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Thus, 36750 J of energy is needed in raising the temperature of 250 g of water from 20°C to 55°C.

Answer 2

Answer:

250*4.2*35=36750j will be the correct answer hope it helps you