A "neon" sign contains 2.4 × 10² mL of argon. Assuming that the gas is at standard temperature and pressure, there is 1.00 moles of gas per 22.4 L of volume. How many argon atoms are present in this sign?

Question

Quizplus · Accepted Answer

At standard temperature and pressure (STP), 1 mole of any gas occupies 22.4 liters. Given that the sign contains 2.4 × 10^12 mL (or 2.4 × 10^3 L) of argon, we can calculate the number of moles of argon present: 2.4 × 10^3 L / 22.4 L/mole = 107.14 moles of argon. Since 1 mole of any substance contains Avogadro's number of particles (approximately 6.022 × 10^23 particles/mole), the total number of argon atoms is 107.14 moles × 6.022 × 10^23 atoms/mole = 6.45 × 10^25 atoms, which is closest to the option A.

A "Neon" Sign Contains 2