24th of April 2010 1
A neon sign is made of glass tubing whose inside diameter is 4.9 cm and whose length is 5.3 m. If the sign contains neon at a pressure of 2.03 torr at 33°C, how many grams of neon are in the sign?
Dr.A 1:42 am 24/04 of 2010
r = 4.9/2 = 2.45 cm = 0.245 dm
V = 53 dm x 3.14(0.245)^2 = 9.99 dm^3
p = 2.03 /760=0.00267
T = 33 + 273 = 306 K
n = 9.99 x 0.00267 / 0.0821 x 306=0.00106
20.18 g/mol x 0.00106 mol= 0.0214 g
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