Calculate the mass of sodium hydroxide in 5.00 dm3 of a 0.125 mol dm-3 solution. [NaOH = 40 g mol-1]

  • A 0.0156 g
  • B 0.625 g
  • C 1.00 g
  • D 25.0 g
waec 2002chemistry

The correct answer is D. 25.0 g

1 mole of NaOH per dm3 has a mass of 40g.

mass of NaOH in 0.125mole

= 0.125 x 40 = 5g.

mass in 5.00 dm3 of the solution.

= 5 x 5 = 25.0g.

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