The relative molecular mass of an element is a proportion of the mass of the unified amu. The relative molecular mass of sodium hydroxide is 40.
The molecular mass of a substance is an addition of the individual masses of the element that makes the compound.
Moles of NaOH = 8 mole
Molarity = 0.2 M
Moles of sodium hydroxide in 25 cm³: 25 × 0.2 = 0.005 moles
The mole ratio between the two moles:
0.2 ÷ 0.005 = 40
Therefore, 40 is the relative molecular mass of the acid.
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