$$1$$ g of water, of volume $$1cm3at$$ $$100$$°C, is converted into steam at same temperature under normal atmospheric pressure (1$$×$$105$$ $$Pa).The volume of steam formed equals $$1671cm3$$. If the specific latent heat of vaporisation of water is $$2256$$ $$J/g$$, the change in internal energy is,

Question

$$1$$ g of water, of volume $$1cm3at$$ $$100$$°C, is converted into steam at same temperature under normal atmospheric pressure (1$$×$$105$$ $$Pa).The volume of steam formed equals $$1671cm3$$. If the specific latent heat of vaporisation of water is $$2256$$ $$J/g$$, the change in internal energy is,

Infinity Learn · Accepted Answer

Δ$$Q=2256$$×$$1=2256$$ J Δ$$W=PVsteam$$ $$-Vwater$$  $$=1$$×$$105$$[$$1671-1$$]×$$10-6=1670$$×$$105$$×$$10-6=167$$ JBy first law of thermodynamics: As Δ$$Q=$$Δ$$U+$$Δ$$W2256=$$Δ$$U+167$$Δ$$U=2089$$ J

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1 g of water, of volume 1cm3at 100°C, is converted into steam at same temperature under normal atmospheric pressure (1×105 Pa).The volume of steam formed equals 1671cm3. If the specific latent heat of vaporisation of water is 2256 J/g, the change in internal energy is,

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