Question

How many moles of silicon (Si) atoms are equivalent to 65.8 g Si?

Answer 1

2 is the answer buuutttt.........

2.34 mol is the correct answer.

The molar mass of Silicon is 28.0855 grams

Divide 65.8g by that number to get 2.34

Answer 2

Answer: 2.35 moles of Silicon are equivalent.

Explanation: Moles can be calculated as:

               $Moles=\frac{\text{Given mass}{Molar mass}$

Here, Si atom is given, so substituting the masses in above equation, we get

Molar mass = 28 g/mol

Given mass = 65.8 g

$Moles=\frac{65.8g}{28g/mol}$

Moles of Si atoms = 2.35 moles