Question

a silicon wafer with dimensions 19.00 cm×19.00 cm×0.0500 cm contains 1.50 moles of silicon. how many grams of si does this represent? g si

Explanation:

Step1: Recall molar - mass formula

The formula to convert moles to grams is $m = n\times M$, where $m$ is the mass in grams, $n$ is the number of moles, and $M$ is the molar mass.

Step2: Identify the molar mass of silicon

The molar mass of silicon ($Si$) is $M = 28.09\ g/mol$.

Step3: Calculate the mass of silicon

We know $n = 1.50\ mol$ and $M=28.09\ g/mol$. Substitute these values into the formula $m = n\times M$. So, $m=1.50\ mol\times28.09\ g/mol$.
$m = 42.135\ g$.

Answer:

$42.1\ g$ (rounded to 3 significant figures)