The internal energy change (in J) when 90 g of water undergoes complete evaporation at `100^(@)C ` is ______ . (Given : `Delta H_("vap")` for water at 373 K = 41 kJ mol , `R = 8.314 JK^( 1) mol^( 1)`) Untitled Document Delta H Vap Water Heat of Fusion Explained ChemTalk The difference between `Delta`H and `Delta`U at constant volume is equal to
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