Question

15. If a solution is prepared by dissolving
40 g of sodium hydroxide in distilled
water then moles of NaOH will be *
O a. 3
O b.2
O c.4
d. 1​

Answer 1

Answer:

4

Explanation:

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Answer 2

Given:

Mass of NaOH = 40 g.

To Find:

Number of moles of NaOH.

Solution:

No. of moles = Given mass/ Molar mass

Atomic mass of Na = 23 u, O = 16 u, H = 1 u.

Molar mass of NaOH = 23 + 16 + 1 = 40 g.

Therefore,

No. of moles = 40/40 = 1 mole.

The number of moles of NaOH will be 1 mole.