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
jamb 2016chemistry

The correct answer is C. 0.50 moldm-3

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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