Question

what is the molar mass of water (h₂o)?
a. 12.00 g/mol
b. 18.02 g/mol
c. 16.00 g/mol
d. 44.00 g/mol

Explanation:

Step1: Find molar mass of H

The molar mass of hydrogen (\(H\)) is \(1.01\space g/mol\). Since there are 2 hydrogen atoms in \(H_2O\), the total mass contributed by hydrogen is \(2\times1.01 = 2.02\space g/mol\).

Step2: Find molar mass of O

The molar mass of oxygen (\(O\)) is \(16.00\space g/mol\). There is 1 oxygen atom in \(H_2O\).

Step3: Calculate molar mass of \(H_2O\)

Add the masses from hydrogen and oxygen: \(2.02+16.00=18.02\space g/mol\)

Answer:

B. \(18.02\space g/mol\)