How many grams of water can be produced from 15 grams of hydrogen
2H2 + O2 —> 2H2O

135g

Explanation:

The equation for the reaction is given below:

2H2 + O2 —> 2H2O

Next, let us calculate the mass of H2 that reacted and the mass of H2O produced from the balanced equation. This is illustrated below:

Molar Mass of H2 = 2x1 = 2g/mol

Mass of H2 from the balanced equation = 2 x 2 = 4g

Molar Mass of H2O = (2x1) + 16 = 2 + 16 = 18g/mol

Mass of H2O from the balanced equation = 2 x 18 = 36g

From the balanced equation,

4g of H2 produced 36g of H2O.

Therefore, 15g of H2 will produce = (15x36)/4 = 135g of H2O

From the calculations made above, 15g of H2 produced 135g of water (H2O)

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