Question

A sample of aluminium has a mass of 54.0 g. What is the mass of the same number of magnesium atoms? (At . wt. Al = 27. Mg = 24)

• A. 12 g
• B. 24 g
• C. 48 g
• D. 96 g.

Answer 1

The correct option is C 48 g

Given,
moles of $Al$ = moles of $Mg$

Mole of $Al=\frac{54}{27}=2=\text{moles of}Mg$
$\therefore$ mass of $Mg=2\times 24=48g$