for water is at 1 bar and . Change in internal energy for this vaporisation under same condition is . (Integer answer)

[Given: ]

Question

for water is  at 1 bar and . Change in internal energy for this vaporisation under same condition is  . (Integer answer)

[Given: ]

Canvas Classes · Accepted Answer

Strategy:
 Use the thermodynamic relation . Ensure all units are consistent (kJ or J).

Step 1: Setup the reaction and find 
Reaction: 
Total moles of gaseous products .
Total moles of gaseous reactants .
.

Step 2: Perform the calculation
Given: .

Rounding to the nearest integer: .

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