How many moles are in a 12.0 g sample of iron (II) oxide

if u mix the ironoxide equal to the value of its molecular weight in one litre of water is considered as1 molar solution.

To determine the number of moles in a given sample of a compound, you need to use the formula:

Number of moles = Mass of compound / Molar mass of compound

In this case, you are given the mass of iron (II) oxide as 12.0 g. First, we need to determine the molar mass of iron (II) oxide. The compound formula for iron (II) oxide is FeO.

1. Find the molar masses of the elements:
- Molar mass of Fe (iron) = 55.85 g/mol
- Molar mass of O (oxygen) = 16.00 g/mol

2. Calculate the molar mass of iron (II) oxide (FeO):
- Molar mass of FeO = Molar mass of Fe + Molar mass of O
- Molar mass of FeO = 55.85 g/mol + 16.00 g/mol
- Molar mass of FeO = 71.85 g/mol

3. Now, use the formula to find the number of moles:
- Number of moles = Mass of compound / Molar mass of compound
- Number of moles = 12.0 g / 71.85 g/mol

Calculating the above gives us the number of moles in the 12.0 g sample of iron (II) oxide.