1
JEE Main 2021 (Online) 27th July Morning Shift
Numerical
+4
-1
For water at 100$$^\circ$$ C and 1 bar,

$$\Delta$$vap H $$-$$ $$\Delta$$vap U = _____________ $$\times$$ 102 J mol$$-$$1. (Round off to the Nearest Integer)

[Use : R = 8.31 J mol$$-$$1 K$$-$$1]

[Assume volume of H2O(l) is much smaller than volume of H2O(g). Assume H2O(g) treated as an ideal gas]
2
JEE Main 2021 (Online) 25th July Evening Shift
Numerical
+4
-1
A system does 200 J of work and at the same time absorbs 150 J of heat. The magnitude of the change in internal energy is ____________ J. (Nearest integer)
3
JEE Main 2021 (Online) 25th July Morning Shift
Numerical
+4
-1
At 298 K, the enthalpy of fusion of a solid (X) is 2.8 kJ mol$$-$$1 and the enthalpy of vaporisation of the liquid (X) is 98.2 kJ mol$$-$$1. The enthalpy of sublimation of the substance (X) in kJ mol$$-$$1 is _____________. (in nearest integer)
4
JEE Main 2021 (Online) 22th July Evening Shift
Numerical
+4
-1
If the standard molar enthalpy change for combustion of graphite powder is $$-$$2.48 $$\times$$ 102 kJ mol$$-$$1, the amount of heat generated on combustion of 1 g of graphite powder is ___________ kJ. (Nearest integer)
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