Question

If weight of sugar taken is 5 g in 108 g of water then molar mass of sugar will be a) 358 g/mol b) 120 g/mol c) 240 g/mol d) 400 g/mol

Answer 1

The molar mass of sugar is 358 g/mol.

Given: The weight of sugar taken is 5 g in 108 g of water.

To Find: The molar mass of sugar.

Solution:

• We can solve this question by the formula,

Number of moles = Given mass x Molar mass                              ......(1)

• Since it is said that the sugar is taken ( or dissolved completely ) in water, so the number of moles of sugar and water must be equal.

Coming to the numerical, we are given;

The weight of sugar (w1) taken = 5 g.

The weight of water (w2) taken = 108 g

The molar mass of water (m2) = 18 g

Let the molar mass of sugar be 'm1'

So, we can say that;

      m1 × w1 = m2 × w2

 ⇒  m1 × 5 = 18 × 108

 ⇒  m1 = ( 18 × 108 ) / 5

 ⇒  m1 = 358.8 g/mol

Hence, the molar mass of sugar is 358 g/mol.

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Answer 2

If weight of sugar taken is 5 g in 108 g of water then molar mass of sugar will be

(A) 358

(B) 120 (C) 240

(D) 400

Answer is 358 g A)

C