1
JEE Main 2020 (Online) 5th September Evening Slot
Numerical
+4
-0
Change Language
For a dimerization reaction,
2A(g) $$ \to $$ A2(g)
at 298 K, $$\Delta $$Uo = –20 kJ mol–1, $$\Delta $$So = –30 JK–1 mol–1,
then the $$\Delta $$Go will be _____ J.
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2
JEE Main 2020 (Online) 2nd September Evening Slot
Numerical
+4
-0
Change Language
The heat of combustion of ethanol into carbon dioxide and water is – 327 kcal at constant pressure. The heat evolved (in cal) at constant volume and 27oC (if all gases behave ideally) is (R = 2 cal mol–1 K–1) ________.
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3
JEE Main 2020 (Online) 2nd September Morning Slot
Numerical
+4
-0
Change Language
The internal energy change (in J) When 90 g of water undergoes complete evaporation at 100oC is ____________.

(Given : $$\Delta $$Hvap for water at 373 K = 41 kJ/mol,
R = 8.314 JK–1 mol–1)
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4
JEE Main 2020 (Online) 8th January Evening Slot
Numerical
+4
-0
Change Language
At constant volume, 4 mol of an ideal gas when heated from 300 K to 500K changes its internal energy by 5000 J. The molar heat capacity at constant volume is _______.
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