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Calculate the mass of sodium hydroxide in 5.00 dm3 of a 0.125 mol dm-3 solution...

Chemistry
WAEC 2001

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

  • A. 0.0156 g
  • B. 0.625 g
  • C. 1.00 g
  • D. 25. 0 g
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Correct Answer: Option D
Explanation

1 mole of NaOH per dm3 has a mass of 40g mass of NaOH in 0.125 mole = 0.125 x 40 = 5g mass in 5.00 dm3 of the solution = 5 x 5 = 25.0g

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