How many miles of water are there in a sample that has a mass of 4.842 g

Question

Conversion

Answer 1

Hello Sarah

 

In your question, I believe you meant to state “moles” and not miles. 

 

To convert grams to moles and vice-versa, you need the molar mass of that substance. Water (H₂O) has a molar mass of 18 g /mol.

 

4.842 g H₂O x (1 mol H₂O / 18 g H₂O) = 0.2690 mol H₂O**

 

**4.842 has 4 significant figures, therefore moles of H₂O must also be reported to 4 sig figs.