65. 0.5 molar solution NaOH containe:
A. 40g NaOH in one dm
B. 80g NaOH in one dm'
C. 10g NaOH in one om?
D. 20g NaOH in one dm?
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Explanation:
The molar mass of NaOH is 40 g/mol.
The number of moles of NaOH is equal to the ratio of its mass to molar mass.
The number of moles of NaOH =
40g/mol
40g
=1mol
The molarity of NaOH solution is the ratio of number of moles of NaOH to total volume of solution in L.
M=
1L
1mol
=1M
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