A 200g of gas was heated from 50°C to around 120°C. The gas expanded in a piston-cylinder apparatus from 2.0L of initial volume to find a volume of 10.0L against an external pressure of 3.0 atm. Calculate for the change in the internal energy. The specific heat of water is 2.19 J/g×°C)
Solution;
"\\Delta u=q+W"
"q=mC\\Delta T"
"q=200\u00d72.19(120-50)"
"q=30660J"
"W=-P(V_2-V_1)"
"W=-303.975(10-2)"
"W=2431.8J"
Hence;
"\\Delta u=30660-2431.8=28.23kJ"
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