What is the concentration of a solution containing 1.0 g of sodium hydroxide in 250 cm³ of solution? A- 0.025 mol/dm³
B- 0.10 mol/dm³
C- 0.25 mol/dm³
D- 1.0 mol/dm³

Correct option is

D-1.0mol/dm³

Mass of NaOH (m) = 1g

The volume of water (V) = 250 ml

Mol. wt of NaOH (m) = 40g/mol

Molarity (M) =M×V(ml)m×1000

M=40×2501×1000

M=101 or 0.1 M

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.