Question

In 28 grams of water (H2O), how many moles do you have?

Atomic masses:

Hydrogen: 1 g/mol.

Oxygen: 16 g/mol.

Perform the procedure.

Answer 1

answer: 2 moles.

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Answer 2

Answer:

There are 1.56 moles of water in a 28 gram sample of water

Explanation:

There are 1.56 moles of water in a 28 gram sample of water.

The molar mass of water is 18.02 g/mol

. To determine the moles of water, divide the grams of water by the molar mass.

28 grams / 18.02 g/mol

= 1.56moles

Notice the answer just has 2 significant figures because the number given in the problem only has 2 significant figures.