Stoichiometry
Specific gravity on API scale is given by the relation(where, G = specific gravity at 15.5°C).

°API = (140/G) - 130
°API = 145 - (145/G)
°API = 200(G - 1)
°API = (141.5/G) - 131.5

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

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