If 15.8 grams of sodium react with excess water, how many liters of hydrogen gas can be produced at 303 kelvin and 1.30 atmospheres? 2 na (s) + 2 h2o  2 naoh (l) + h2 (g)

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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the answer is d.) potassium