A mixture of the compounds sodium oxide and magnesium chloride contains 2.4182 g of sodium oxide and is 89.3 % by mass magnesium chloride. The sodium oxide is 74.200 % by mass sodium. Calculate the moles of oxygen in the mixture.

Thanks in advance.

All of those numbers are meant to confuse you. You need only grams Na2O. The other numbers are useless.

2.4182 g Na2O/molar mass = mols Na2O
mols O = mols Na2O.

I knew something was fishy about this question. Thank you!

To calculate the moles of oxygen in the mixture, we need to determine the mass of magnesium chloride in the mixture and then use that to find the moles of oxygen. Here's how you can get the answer:

Step 1: Determine the mass of magnesium chloride in the mixture.
Given that the mixture is 89.3% by mass magnesium chloride, we can calculate the mass of magnesium chloride using the mass of the mixture.
Let M be the mass of the mixture.
Mass of magnesium chloride = 89.3% of M = (89.3/100) * M

Step 2: Determine the mass of sodium oxide in the mixture.
Given that the mass of sodium oxide is 2.4182 g and it is 74.200% by mass sodium, we can calculate the mass of sodium in sodium oxide.
Mass of sodium = 74.200% of 2.4182 g = (74.200/100) * 2.4182 g
Next, we can calculate the mass of oxygen in sodium oxide using the mass of sodium oxide.
Mass of oxygen = Mass of sodium oxide - Mass of sodium

Step 3: Calculate the moles of oxygen.
To calculate the moles of oxygen, we need to convert the mass of oxygen to moles using the molar mass of oxygen. The molar mass of oxygen is approximately 16 g/mol.
Moles of oxygen = Mass of oxygen / Molar mass of oxygen

Now let's plug in the given values to find the answer:

M = mass of the mixture
Mass of magnesium chloride = (89.3/100) * M
Mass of sodium = (74.200/100) * 2.4182 g
Mass of oxygen = Mass of sodium oxide - Mass of sodium
Moles of oxygen = Mass of oxygen / Molar mass of oxygen

By following these steps and calculations, you should be able to find the moles of oxygen in the mixture.