Density is mass over volume, so:
14.3/8.46≈ 1.6903 g/cm^3
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Answer:
Since electrons cannot have the same set of quantum numbers, a maximum of two can be in the n = 1 level, and a third electron must reside in the higher-energy n = 2 level. If there are two electrons in the n = 1 level, their spins must be in opposite directions.
Answer: 1.15x10²³ molecules C
Explanation: solution attached:
Convert mass of C to moles using its molar mass then multiply to the Avogadro's number.