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A student used a carbon pencil to write ...

A student used a carbon pencil to write his homework. The mass of this was found to be 6 mg. With the help of this calculate.
The number of carbon atoms in 12 mg of his homework writting

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A student used a carbon pencil to write his homework . The mass of this was found to be 5 mg. With the help of this calculate The number of carbon atoms in 12mg of his homework writing.

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