r just means there's a number of carbon in teh chain. for example rcooh means that after x number of carbon, the chain ends with cooh.
explanation:
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Adozen is 12, and your needing to calculate the weight of one medium egg, so i would do 21/12=1.75 per egg, and check your answer by doing 1.75 * 12= 21 : ) : ): ): ): ) i hoped i
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