Question

The molarity of 2.925 % (W/V) sodium chloride solution
is
a)0.5 M
b)1.OM
c)5.0M
d)0.25M​

Answer 1

Answer:

a)0.5m.....

Explanation:

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Answer 2

First, define the percentage solution: 2.925% w/v solution = 2.925 g/100 mL

Since molarity is defined in terms of g/L, convert 2.925 g/100 mL to g/L:

2.925 g/l00 ml = X g/1.0 L (1000 mL)

X = 2.925 x 1000 /100

X = 292500 g/L

Once the number of grams of solute per liter is known, the molarity can be calculated:

Molarity = g of solute/GMW of solute x 1 liter

X = 292500 g/GMW x 1.0

(GMW = Na 22.99 + Cl 35.45 = 58.44)

X = 292500/58.44

Molarity = 5.0M