How many moles of 12c are there in a 3.50 g sample of this substance?

Explanation:

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In this case, by means of the given mass, we should remember that one mole of a particular element, equal its atomic mass. In such a way, since carbon is the involved element and its molar mass is 12g/mol, we perform the following mathematical operation in order to obtain the moles via proportions:

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answer carbon and three oxygen atoms;