Which of the following gases contains the highest number of atoms at s.t.p?

At standard temperature and pressure (STP), one mole of any gas occupies a volume of 22.4 liters. This is known as the molar volume of a gas at STP. To determine which gas contains the highest number of atoms at STP, we need to calculate the total number of atoms present in each given amount of gas. To do this, we will use Avogadro's number, which is approximately 6.022 x 10^23 atoms per mole. Let's calculate the number of atoms in each option: - 6 moles of neon: 6 x (6.022 x 10^23) = 3.6132 x 10^24 atoms - 3 moles of oxygen: 3 x (6.022 x 10^23 x 2) = 3.6132 x 10^24 atoms - 2 moles of chlorine: 2 x (6.022 x 10^23 x 2) = 2.4136 x 10^24 atoms - 1 mole of ethane: 1 x (6.022 x 10^23 x 8) = 4.8176 x 10^23 atoms From the above calculations, we can see that 6 moles of neon and 3 moles of oxygen both contain the highest number of atoms at STP, with a total of 3.6132 x 10^24 atoms each. Therefore, the answer is either 6 moles of neon or 3 moles of oxygen, depending on the context of the question.