Question

Which is true when comparing one mole of Cl2 (gas) to one mole of Ne (gas) at STP? a. Chlorine has a greater mass. b. Chlorine has a greater volume. c. Neon has a greater mass. d. Neon has a greater volume

Answer 1

A. Chlorine has a greater mass

Explanation:

The concept of molar volume, or the amount of volume taken up by a mole of gas under standard conditions, can be applied universally to any gas, so the answer cannot be B or D. On the periodic table, chlorine has a higher mass number (not to mention that it naturally occurs as `Cl_2`), so a given volume or number of moles of chlorine will have more mass than an equivalent volume or number of moles of neon.