Answer:
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).