Stoichiometry
S.T.P. corresponds to

760 mm Hg gauge pressure & 15.5°C
1 atm. absolute pressure & 15.5°C
760 torr & 0°C
101.325 kPa gauge pressure & 15.5°C

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Stoichiometry
A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the

Equivalent weight of the metal is 4
Atomic weight of the metal is 4
Atomic weight of the metal is 2
Equivalent weight of the metal is 8

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