Which of the following gases would have the greatest volume at stp? . a. 5.00 moles of h2 gas. b. 5.00 g of rn gas. c. 6.02 × 1023 particles of ne gas. d. all of the above will have the same volume at stp. e. can't determine from the information given.

To determine the answer above, assume that the gases behave as ideal and that we only need to compare the number of moles.
For letter A. there are 5 moles of H2 gas.
For letter B, convert the amount in gas to moles by dividing it by 222 g/mol. This gives an answer of 0.0225 moles
For letter C, the given amount is Avogadro's number which corresponds to 1 mole.

Thus, the answer is letter A.