Question

what is the mass of 4.100 mol ca(oh)₂? answer in units of g. 1. 333.45 2. 274.17 3. 244.53 4. 170.43 5. 214.89 6. 377.91 7. 303.81 8. 318.63 9. 355.68 10. 200.07

Explanation:

Step1: Calculate molar mass of \( \text{Ca(OH)}_2 \)

Molar mass of \( \text{Ca} = 40.08 \, \text{g/mol} \), \( \text{O} = 16.00 \, \text{g/mol} \), \( \text{H} = 1.008 \, \text{g/mol} \).
For \( \text{Ca(OH)}_2 \):
\( \text{Molar mass} = 40.08 + 2\times(16.00 + 1.008) = 40.08 + 2\times17.008 = 40.08 + 34.016 = 74.096 \, \text{g/mol} \).

Step2: Calculate mass using \( \text{mass} = \text{moles} \times \text{molar mass} \)

Given moles \( = 4.100 \, \text{mol} \), molar mass \( = 74.096 \, \text{g/mol} \).
\( \text{Mass} = 4.100 \times 74.096 = 303.7936 \approx 303.81 \, \text{g} \).

Answer:

1. 303.81