How much energy is transferred when 1 gm of boiling water at 100°C co

1.	How much energy is transferred when 1 gm of boiling water at 100°C cools to water at 0°C ?
Answer» Stage 1 → Heat releases from water vapour at 100°C When converts into water at 100°C = Latent heat of vapourization = 540 cal (Q₁) Stage 2 → Heat energy releases from water at 100°C When converts into water at 0°C Q₂ = mSΔT, Here ΔT = 100°C – 0°C = 100°C (∵ m = 1 gm; S = 1 Cal/gm°C.) = 1 ×1 ×100 = 100 Cal. Total energy releases ⇒ Q₁ + Q₂ ⇒ 540 + 100 ⇒ 640 Cal.

How much energy is transferred when 1 gm of boiling water at 100°C cools to water at 0°C ?

Answer»

Stage 1 → Heat releases from water vapour at 100°C

When converts into water at 100°C = Latent heat of vapourization

= 540 cal (Q₁)

Stage 2 → Heat energy releases from water at 100°C

When converts into water at 0°C

Q₂ = mSΔT, Here ΔT = 100°C – 0°C = 100°C

(∵ m = 1 gm; S = 1 Cal/gm°C.)

= 1 ×1 ×100 = 100 Cal.

Total energy releases ⇒ Q₁ + Q₂ ⇒ 540 + 100 ⇒ 640 Cal.

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How much energy is transferred when 1 gm of boiling water at 100°C cools to water at 0°C ?

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