The molecular mass of $K_{2} C O_{3}$ is:

128 u

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112 u

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116 u

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138 u

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90 u

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Solution

The correct option is D 138 u
$M o l e c u l a r m a s s o f K_{2} C O_{3} = (39 \times 2) + 12 + (16 \times 3) = 78 + 12 + 48 = 138 u$

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