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Question

Calculate the formula unit mass of K2CO3


A

45amu

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B

55amu

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C

117amu

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D

138amu

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Solution

The correct option is D

138amu


The atomic weight of K= 39

The atomic weight of C=12

The atomic weight of O=16

The molecular weight of K2CO3=2×39+1×12+3×16

=138 AMU


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