Mole fraction of A in H2O is 0.2. The molarity of A in H2O is:
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Explanation:
In 1 mol solution A is 0.2 mol and water is 0.8 mol
Weight of water is 0.8 x18(g)
Volume = 0.8×18×1/1000 L (density =1)
Molarity = 0.2/volume
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