If the sign contains neon at a pressure of 1.77 torr at 31C, how many grams of neon are in the sign?

A neon sign is made of gl tubing whose inside diameter is 2.5 cm and whose length is 5.5 m. If the sign contains neon at a pressure of 1.77 torr at 31C, how many grams of neon are in the sign?