Question

calculate the molar mass of calcium nitrate.
136.03 g/mol
164.10 g/mol
102.09 g/mol
132.10 g/mol
none of the above

Explanation:

Step1: Determine the formula of calcium nitrate

Calcium nitrate has the chemical formula \( \text{Ca(NO}_3\text{)}_2 \). This means there is 1 calcium (Ca) atom, 2 nitrogen (N) atoms, and 6 oxygen (O) atoms.

Step2: Find the atomic masses

From the periodic table, the atomic masses are:

• Atomic mass of Ca: \( 40.08 \, \text{g/mol} \)
• Atomic mass of N: \( 14.01 \, \text{g/mol} \)
• Atomic mass of O: \( 16.00 \, \text{g/mol} \)

Step3: Calculate the molar mass

For \( \text{Ca(NO}_3\text{)}_2 \):

• Mass of Ca: \( 1 \times 40.08 = 40.08 \, \text{g/mol} \)
• Mass of N: \( 2 \times 14.01 = 28.02 \, \text{g/mol} \)
• Mass of O: \( 6 \times 16.00 = 96.00 \, \text{g/mol} \)

Now, sum these masses:
\( 40.08 + 28.02 + 96.00 = 164.10 \, \text{g/mol} \)

Answer:

164.10 g/mol (corresponding to the option "164.10 g/mol")