1.

Theheat capcity of liquildwater is 75.6 J //mol .K, while theenthalpy of fusion of ice is6.0 kJ//mol, What is the smallestnumberof icecubes at0^(@) C,eachcontainig9.0g of water ,needed to cool500 gofliquildwaterfromj 20^(@)to 0^(@) C ?

Answer»

1
7
14
None of these

Solution :`DeltaU =Q + W`
` = 100 -[1 XX 1 + 1//2xx 1]"bar" m^(3)""("1 bar " m^(3) = 10^(5) J= 100 k)`
`= - 50 kJ`


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