First slide

Atoms; molecules and matter

Question

Mass per cent of Na in Na₂CO₃ is

Moderate

A

21.52%
B

31.20%
C

38.20%
D

43.40%

Solution

Mass per cent of Na $= \frac{2 M_{Na}}{M_{{Na}_{2} {CO}_{3}}} \times 100 = \frac{46}{106} \times 100 % = 43 .40 %$

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