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Stoichiometry

Stoichiometry
N₂ content in a urea sample was found to be only 42%. What is the actual urea content of the sample ? (molecular weight of urea = 60)

0.95
0.8
0.9
0.98

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Stoichiometry
The molar composition of a gas is 10% H₂, 10% O₂, 30% CO₂ and balance H₂O. If 50% H₂O condenses, the final mole percent of H₂ in the gas on a dry basis will be be

0.05
0.1
0.2
0.1818

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Stoichiometry
The temperature of a gas in a closed container is 27° C. If the temperature of the gas is incresed to 300° C, then the pressure exerted is

Trebled
Unpredictable
Halved
Doubled

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Stoichiometry
CaCO₃ contains __________ percent of Ca by weight.

48
12
96
40

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Stoichiometry
1 torr is equivalent to

1 ata
1 mm Hg
1 Pascal
1 mm wc

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Stoichiometry
With increase in the temperature of pure (distilled) water, its

POH decreases and pH increases
PH decreases and pOH increases
POH and pH both 4ecreases
PH and pOH both increases

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