Question 542: Thermodynamics & KTG

Question

A steam engine intakes 50 g of steam at 100$$^\circ$$C per minute and cools it down to 20$$^\circ$$C. If latent heat of vaporization of steam is 540 cal g
$$-$$1
, then the heat rejected by the steam engine per minute is __________ $$	imes$$ 10
3
cal.
(Given : specific heat capacity of water : 1 cal g
$$-$$1
$$^\circ$$C
$$-$$1
)

Accepted Answer

$$\Delta$$Q
rej
= 50 $$	imes$$ 540 + 50 $$	imes$$ 1 $$	imes$$ (100 $$-$$ 20)
= 50 $$	imes$$ [540 + 80]
= 50 $$	imes$$ 620
= 31000 cal
= 31 $$	imes$$ 10
3
cal

Thermodynamics & KTG

Integer / Numeric Answer Type