Questions: The molar mass of calcium hydroide is 74.1 g / mol 38.1 g / mol 114 g / mol 73.1 g / mol 63.55+57.1 g / mol

Transcript text: The molar mass of calcium hydroxide is $\qquad$ $74.1 \mathrm{~g} / \mathrm{mol}$ $38.1 \mathrm{~g} / \mathrm{mol}$ $114 \mathrm{~g} / \mathrm{mol}$ $73.1 \mathrm{~g} / \mathrm{mol}$ $63.55+57.1 \mathrm{~g} / \mathrm{mol}$

Solution

Solution Steps

Step 1: Identify the Chemical Formula

The chemical formula for calcium hydroxide is $ \text{Ca(OH)}_2 $.

Step 2: Determine the Atomic Masses

The atomic mass of calcium (Ca) is approximately $ 40.08 \, \text{g/mol} $.
The atomic mass of oxygen (O) is approximately $ 16.00 \, \text{g/mol} $.
The atomic mass of hydrogen (H) is approximately $ 1.008 \, \text{g/mol} $.

Step 3: Calculate the Molar Mass

The molar mass of calcium hydroxide $ \text{Ca(OH)}_2 $ is calculated as follows: \[ \text{Molar mass of } \text{Ca(OH)}_2 = 40.08 + 2 \times (16.00 + 1.008) \] \[ = 40.08 + 2 \times 17.008 \] \[ = 40.08 + 34.016 \] \[ = 74.096 \, \text{g/mol} \]

Step 4: Round to Appropriate Significant Digits

Rounding $ 74.096 \, \text{g/mol} $ to four significant digits gives $ 74.10 \, \text{g/mol} $.