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STOICHIOMETRY

Stoichiometry
One 'Therm' is equivalent to

10⁹ BTU
10⁵ BTU
10⁵ kcal
10⁹ kcal

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Stoichiometry
Refluxing of part of the distillate in a fractionating column is a 'recycling operation', aimed primarily at

Product enrichment
None of these
Yield enhancement
Heat conservation

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Stoichiometry
Isotopes are atoms having the same

None of these
Mass number
Number of neutrons
Atomic mass

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Stoichiometry
One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH₄ + 2O₂ → CO₂ + 2H₂O. Both the reactants and products are in gas phase. ΔH°298 = - 730 kJ/mole of methane. If the average specific heat of all the gases/vapour is 40 J/mole.K, the maximum temperature rise of the exhaust gases in °C would be approximately equal to

1225
1735
1525
1335

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Stoichiometry
Pick out the wrong unit conversion.

1 mm Hg = 1 torr = 133.3 Pa
None of these
1 kPa = 100 bar
1 atm. = 760 mm Hg = 29.92 inch Hg = 14.7 psi = 1.013 bar = 1.013 kgf/cm²

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