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Calculate the mass of sodium hydroxide in 5.00 dm3

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

View answer & explanation

Correct answer is D

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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