Question

43.0 g al
express your answer in moles to three significant figures.

Explanation:

Step1: Identify molar - mass of Al

The molar mass of aluminum (Al) is $26.98\ g/mol$.

Step2: Use the mole - mass formula

The formula to calculate the number of moles ($n$) is $n=\frac{m}{M}$, where $m$ is the mass and $M$ is the molar mass. Given $m = 43.0\ g$ and $M=26.98\ g/mol$, then $n=\frac{43.0\ g}{26.98\ g/mol}$.

Step3: Calculate the number of moles

$n=\frac{43.0}{26.98}\ mol\approx1.59\ mol$

Answer:

$1.59\ mol$