Question

The equivalent mass of a certain bivalent metal is $25\text{g}$. The gram molar mass of its anhydrous chloride is:

• A. $51\text{g}$
• B. $121\text{g}$
• C. $79\text{g}$
• D. $34\text{g}$

Answer 1

The correct option is B $121\text{g}$

Let the metal that reacts be $M$
The metal is bivalent, the gram molar mass $=2\times 25=50\text{g}$
A bivalent metal forms a chloride that has the formula $MC{l}_2$
Molar mass of the metal chloride $=50+(2\times 35.5)=121\text{g}$