How much water, in grams, can be made from 4.12 * 1024 hydrogen molecules?

1. 195.858

2. 244.898

3. 44.554

4. 159.378

5. 93.8924

6. 170.143

7. 35.2844

8. 123.196

9. 220.677

10. 72.961

Option 8. 123.192g

Explanation:

From Avogadro's hypothesis, 1mole of any substance contains 6.02x10^23 molecules. Therefore 1mole of H2 contains 6.02x10^23 molecules.

1mole of H2 = 2x1 = 2g

If 1 mole (i. e 2g) of H2 contains 6.02x10^23 molecules,

Then Xg of H2 will contain 4.12 * 10^24 molecules i. e

Xg of H2 =

(2x4.12 * 10^24) / 6.02x10^23 = 13.688g.

Now let us generate a balanced equation for the reaction between of Hydrogen to produce water:

2H2 + O2 - > 2H2O

Molar Mass of H2 = 2g/mol

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

Molar Mass of H20 = (2x1) + 16 = 18g/mol

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

From the equation,

4g of H2 produced 36g of H2O.

Therefore, 13.688g of H2 will produce = (13.688x36) / 4 = 123.192g of H2O

The answer is actually 4218.88 molecules.