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What is the concentration of a solution contain... - JAMB Chemistry 2016 Question

What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution?

[Na=23, O=16, H=1]

A
0.05 moldm-3
B
0.30 moldm-3
C
0.50 moldm-3
D
0.40 moldm-3
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Correct Option: C

2g NaOH is contained in 100cm3

Xg NaOH is contained in 1000cm3

Xgram = (\frac{2\times 1000}{100}) = 20g

Mole = (\frac{20}{40}) = 0.50mol/dm3

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