If the sign contains neon at a pressure of 1.72 torr at 34 degrees C, how many grams of neon are in the sign?

Question

A neon sign is made of glass tubing whose inside diameter is 2.5 cm and whose length is 5.5 m

Answer 1

By the ideal gas law, PV=nRT. P = 1.72 torr, V = (.0125m)² * 3.1416 * 5.5m = .0027m³ = 2.7L, R = 62.364 L Torr mol^-1K^-1, T = 307.15K. n = PV/RT = .000242 mol Neon. .000242 * 20.18g/mol = .00489 g Neon