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/2
M
M/4
2M

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Stoichiometry
The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the

Temperature & pressure
State of aggregation & the state of combination at the beginning & the end of the reaction
None of these
Number of intermediate chemical reactions involved

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