Question

what is the molar mass of mgcl₂?
a 29.00 g/mol
b 89.78 g/mol
c 95.21 g/mol
d 119.52 g/mol

Explanation:

Step1: Determine the atomic masses

The atomic mass of \(Mg\) is \(24.31\ g/mol\), and the atomic mass of \(Cl\) is \(35.45\ g/mol\).

Step2: Calculate the molar mass of \(MgCl_{2}\)

The formula for molar mass of \(MgCl_{2}\) is \(M = M_{Mg}+2\times M_{Cl}\).
Substitute the values: \(M=24.31 + 2\times35.45\).
First calculate \(2\times35.45 = 70.9\).
Then \(M=24.31+70.9\).
\(M = 95.21\ g/mol\)

Answer:

C. \(95.21\ g/mol\)