How many grams of Al2O3 are formed when 30.5 g of O2 reacts with aluminum? 4 Al + 3 O2 --> 2 Al2O3

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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in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.