Question

a sample of phosphorus has 0.25 moles of p4 molecule what is the mass of the sample

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Answer 1

There are 4 atoms in a single molecule of P4.

1 mole of P4 molecule consists of 6.023*10^23 molecules.

Therefore, 0.25 mole of P4 consists of 6.023*10^23 *0.25 molecules of P4.

Therefore, 0.25 mole of P4 = 1.50575 * 10^23 molecules of P4.

Therefore, 1.50575 * 10^23 molecules of P4 = 4* 1.50575 * 10^23 atoms = 6.023*10^23 atoms.

Or simply 1 mole of P4 molecule contains 4 moles of P atom, therefore 0.25 mole of P4 molecule contains 1 mole of P atom. Therefore, 0.25 mole of P4 contains 6.023*10^23 atoms.

Answer 2

Answer:

0.25 mol of p4 molecules contains atoms