Stoichiometry
The density of a gas 'X' is twice that of another gas 'Y'. If the molecular weight of gas 'Y' is 'M'; then the molecular weight of the gas 'X' will be

M/4
M
M/2
2M

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Stoichiometry
Pick out the wrong unit conversion of heat transfer co-efficient.

1 kcal/m².hr.°K = 1.163 W/m².°C
1 W/m² . °C = 0.1761 BTU/ft².hr.°F
1 kcal/m².hr.°C = 0.2048 BTU/ft².hr. °F. = 1.163 W/m².°K
1 BTU/ft².hr.°F = 4.88 kcal/m².hr.°C = 20.44 kJ/m².hr°C = 5.678 W/m².°C

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