SATHEE: Properties Of Solids And Liquids Question 450

Properties Of Solids And Liquids Question 450

Question: An experiment takes 10 minutes to raise the temperature of water in a container from $0^{\circ} C$ to $100^{\circ} C$ and another 55 minutes to convert it totally into steam by a heater supplying heat at a uniform rate. Neglecting the specific heat of the container and taking specific heat of water to be $1 c a l / g^{\circ} C$ , the heat of vapourisation according to this experiment will come out to be :

Options:

A) 560 cal/g

B) 550 cal/g

C) 540 cal/g

D) 530 cal/g

Show Answer

Answer:

Correct Answer: B

Solution:

[b] As $P t = m C Δ T$ So, $P \times 10 \times 60 = m C 100$ …(i) and $P \times 55 \times 60 = m L$ …(ii) Dividing equation (i) by (ii) we get $(θ - θ_{0})$

$∴ L = 550 c a l . / g .$

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Properties Of Solids And Liquids Question 450

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