Question

1. what is the molar mass of calcium hydroxide, ca(oh)₂?

40.1 g/mol
74.1 g/mol
92.1 g/mol
56.1 g/mol
clear all

Explanation:

Step1: Identify atomic masses

Atomic mass of Ca: $40.1\ g/mol$, O: $16.0\ g/mol$, H: $1.0\ g/mol$.

Step2: Calculate for each atom

In $\ce{Ca(OH)2}$, there is 1 Ca, 2 O, 2 H.
Mass from Ca: $1\times40.1 = 40.1\ g/mol$.
Mass from O: $2\times16.0 = 32.0\ g/mol$.
Mass from H: $2\times1.0 = 2.0\ g/mol$.

Step3: Sum the masses

Total molar mass: $40.1 + 32.0 + 2.0 = 74.1\ g/mol$.

Answer:

74.1 g/mol (corresponding to the option with "74.1 g/mol")