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Q.

What is the molecular mass of sodium hydroxide (NaOH)?

(Atomic mass of sodium is 23u, the atomic mass of  hydrogen is 1u, and the atomic mass of oxygen is 16 u)

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a

50

b

40

c

25

d

42

answer is B.

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Detailed Solution

Sodium has an individual mass of 23 u, hydrogen has a mass of 1 u, and of oxygen is 16u. NaOH is the chemical formula for sodium hydroxide.

Molecular mass of sodium hydroxide

 = 1 X atomic mass of sodium + 1 X atomic mass of hydrogen +1 X atomic mass of oxygen

= 1X23 + 1X1 + 1X16

= 23+1+16

= 40u

The molecular mass of sodium hydroxide is 40 u.

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