Pyrite is a mineral which is made from iron and sulfur atoms. Choose all of the statements which are correct. The smallest unit of pyrite is a sulfur or iron atom The smallest unit of pyrite is a molecule containing iron and sulfur. All of the above. The element called sulfur is made of sulfur atoms.

Similarity - 1 mol of NaOH in 1M and 1m.

Difference - 1M - 1 mol NaOH in 1L solution,

1m - 1 mol NaOH in 1000g solvent (water).

Explanation:

M - Molarity,  the number moles of solute are dissolved in 1 L of solution.

m - Molality is the number of moles of solute per 1 (kg) kilogram = 1000 g of solvent.

Similarity - 1 mol of NaOH in 1M and 1m.

Difference - 1M - 1 mol NaOH in 1L solution,

1m - 1 mol NaOH in 1000g solvent (water).