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What is the concentration of a solution containing 2g of NaO...

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

View answer & explanation

Correct answer is 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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