Question

How many moles of cesium (Cs) atoms are in 675g Cs?

Answer 1

The atomic mass of Cs is 132.9. So the mole number of 675 g cesium is 675/132.9 = 5.08 mole. Then the answer should be 5.08 mole.

Answer 2

Answer: 5.08 moles

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

given mass of Cesium (Cs) = 675 g

Molar mass of Cesium (Cs) = 132.90 g/mol

Putting in the values we get:

$\text{Number of moles}=\frac{675g}{132.90g/mol}=5.08moles$

Thus there are 5.08 moles of cesium in 675 g of cesium.