If 0.20 moldm 3 NaOH(aq) was evaporated to yield 5.0g of solid NaOH, calculate the
CHEMISTRY
WAEC 2014
If 0.20 moldm3 NaOH(aq) was evaporated to yield 5.0g of solid NaOH, calculate the volume of NaOH (aq) used. (Na = 23.0,O = 16:0; H = 1.00)
- A. 600cm3
- B. 625cm3
- C. 1000cm3
- D. 1600cm3
Correct Answer: B. 625cm3
Explanation
Mole = 5/40 = 0.125 mole
:. 0.2 mole NaOH dissolved in 1000 cm3
0.125 mole NaOH dissolved in xcm3
xcm3 = \(\frac{0.215 x 1000}{0.2}\)
= 625cm3
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