How many moles of hydrogen gas are generated when 4.0 moles of water react with excess calcium

2moles of H2

Explanation:

First, let us generate a balanced equation for the reaction between calcium and water. This is illustrated below:

Ca + 2H20 —> Ca(OH)2 + H2

From the equation,

2moles of H2O produced 1mole of H2.

Therefore 4moles of H2O will produce = 4/2 = 2moles of H2.

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

plz give brainliest

h