Question

what is the molar mass of water? 18.02 g/mol 12.01 g/mol 33.02 g/mol 22.52 g/mol

Explanation:

Step1: Identify elements in water

Water has the formula $H_2O$, with 2 hydrogen (H) and 1 oxygen (O) atoms.

Step2: Find molar - mass of hydrogen and oxygen

The molar mass of hydrogen $M_H=1.01\ g/mol$ and of oxygen $M_O = 16.00\ g/mol$.

Step3: Calculate molar - mass of water

$M_{H_2O}=2\times M_H+M_O$. Substitute the values: $M_{H_2O}=2\times1.01\ g/mol + 16.00\ g/mol=2.02\ g/mol+16.00\ g/mol = 18.02\ g/mol$.

Answer:

18.02 g/mol