Final answer:
The student is likely asking for a conversion involving carbon, but without clear context, it's challenging to provide an accurate answer. The mass of carbon could be converted to moles using the molar mass, but if the question involves charge, additional information is needed.
Step-by-step explanation:
The student appears to be asking for assistance with a chemistry conversion problem, specifically converting a mass of carbon (C) to a different unit, possibly moles or molecules. The given information does not directly correspond to the provided question, making it challenging to determine the exact calculation desired.
Providing an example using Avogadro's number could be helpful: To convert grams of an element to moles, divide the mass by the molar mass of the element. For carbon, which has a molar mass of 12.011 g/mol, converting 0.390 grams to moles would involve dividing 0.390 g by 12.011 g/mol, yielding 0.03247 moles.
If the question is instead related to charge (such as converting mass to charge), additional context is required for a precise answer, particularly relating to the charge per mole of carbon (if it involves ions or electrochemistry).