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

Solution Steps

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

• 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 \( 1.008 \, \text{g/mol} \).

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

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

Final Answer