Question

188.1 g au
express your answer in moles to four significant figures

Explanation:

Step1: Recall molar - mass of Au

The molar mass of gold (Au) is $M = 196.97\ g/mol$.

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 $m = 188.1\ g$ and $M=196.97\ g/mol$, then $n=\frac{188.1\ g}{196.97\ g/mol}$.

Step3: Calculate the number of moles

$n=\frac{188.1}{196.97}\ mol\approx0.9540\ mol$

Answer:

$0.9540\ mol$