Question

The molar mass of calcium is 40.08, oxygen is 16.0, and hydrogen is 1.01. What is the mass of one mole of calcium hydroxide (Ca(OH)2)?

Answer 1

Answer: The molar mass of calcium hydroxide is 74.1 g/mol

Explanation:

Molar mass is defined as the sum of the mass of all the atoms each multiplied its atomic masses that are present in the molecular formula of a compound. It is expressed in g/mol

We are given:

Molar mass of calcium = 40.08 g/mol

Molar mass of oxygen = 16.0 g/mol

Molar mass of hydrogen = 1.01 g/mol

So, the molar mass of the compound, $Ca(OH)_2=[(1\times 40.08)+2(16.0+1.01)]=74.1g/mol$

Hence, the molar mass of calcium hydroxide is 74.1 g/mol

Answer 2

First find the total molar mass of the compound:
40.08 + (2*16) + (2*1.01)= 74.09g/mol calcium hydroxide
We also know that the units for molar mass is grams per mole, and since the problem is asking for the mass of one mole, the mass would be the same as the molar mass: 74.09g