Question

Calculate the number of moles in 3.20 g of each of the following:
SnO2
Express your answer in moles

Answer 1

To calculate the number of moles in a given substance, we can use the formula:

moles = mass (g) / molar mass (g/mol)

First, we need to calculate the molar mass of SnO2.

The atomic mass of Sn (tin) is 118.71 g/mol.
The atomic mass of O (oxygen) is 16.00 g/mol.

Since SnO2 contains one tin atom and two oxygen atoms, we can add the molar masses to get the molar mass of SnO2:

molar mass of SnO2 = (1 * molar mass of Sn) + (2 * molar mass of O)
molar mass of SnO2 = (1 * 118.71 g/mol) + (2 * 16.00 g/mol)
molar mass of SnO2 = 118.71 g/mol + 32.00 g/mol
molar mass of SnO2 = 150.71 g/mol

Now we can use the formula to calculate the number of moles in 3.20 g of SnO2:

moles = mass (g) / molar mass (g/mol)
moles = 3.20 g / 150.71 g/mol
moles = 0.0213 mol

So, there are 0.0213 moles in 3.20 g of SnO2.