When the chemical equation Cu 2 S+O 2 Cu 2 O+SO 2 is balanced, the coefficient for O 2 will be

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.