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3. 06 g of a sample of potassium trioxochlorate (V) (KCIO...

3. 06 g of a sample of potassium trioxochlorate (V) (KCIO3) was required to make a saturated solution with 10cm3 of water at 25°C. The solubility of the salt at 25°C is [K =39, Cl = 35.5, O = 16]

A.

5.0 moles dm3

B.

3.0 moles dm3

C.

2.5 moles dm3

D.

1.0 molesv

E.

0.5 moles dm3

Correct answer is C

Molar mass of KCIO3 = 122.5 g/mol

3.06g = 10
xg = 1000

frac3.06100010

= 306g
Molar conc = fracMassconcMolarmass
Molar conc = frac306122.5

= 2.497mol/dm3