Question

Which of the following represents 1 mol of phosphine gas, PH3? A) 6.02 x 1023 phosphine molecules B) 34.00 g phosphine gas C) 22.4 L phosphine gas at STP D) all of the above E) none of the above

Answer 1

D) all of the above

Step-by-step explanation:

Which of the following represents 1 mol of phosphine gas, PH₃?

A) 6.02 x 10²³ phosphine molecules. YES. Considering Avogadro's number, 1 mole of a substance contains 6.02 x 10²³ molecules of such substance.

B) 34.00 g phosphine gas. YES. The molar mass of phosphine is equal to the sum of the molar masses of the elements that form it.

MM(PH₃) = MM(P) + 3 × MM(H) = 31.00 g/mol + 3 × 1.00 g/mol = 34.00 g/mol.

C) 22.4 L phosphine gas at STP. YES. At standard temperature (0 °C) and pressure (1 atm), 1 mole of any gas occupies a volume of 22.4 L.