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Stoichiometry

Stoichiometry
Cv for monoatomic gases is equal to(where, R = gas constant)

R
3R
2R
1.5 R

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Stoichiometry
Enthalpy of formation of NH₃ is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH₃ → N₂ + 3H₂, is equal to __________ kJ/kg. mole.

-92
-23
46
92

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Stoichiometry
No cooling occurs, when an ideal gas undergoes unrestrained expansion, because the molecules

Do work equal to loss in kinetic energy
Exert no attractive force on each other
Collide without loss of energy
Are above the inversion temperature

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Stoichiometry
A very dilute solution is prepared by dissolving 'x1' mole of solute in 'x2' mole of a solvent. The mole fraction of solute is approximately equal to

1 - (x1/x2)
X2/x1
1/x2
X1/x2

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Stoichiometry
At higher temperatures, molal heat capacities for most of the gases (at constant pressure) __________ with increase in temperature.

Varies linearly
Does not vary
Increases
Decreases

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Stoichiometry
The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vapourised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is

0.6
0.8
0.4
0.2

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MORE MCQ ON Stoichiometry

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