Type the correct answer in the box. what is the mass of one mole of phosphorous (p) atoms? express your answer to four significant figures. the mass of 1 mole of phosphorus atoms is grams.

the mass of  1  mole of phosphorus atoms is approximately  30 g

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Explanation:

Mass number of an atom means the sum of total number of protons and neutrons present in an atom.

On the other hand, atomic number is the total number of protons present in an atom.

Therefore, mass number of phosphorous is 30 g/mol whereas atomic number of phosphorous is 15 g/mol.

Thus, the mass of 1 mole of phosphorus atoms is 30 grams.

first one is the correct answer