Neon Sign
Neon Sign
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US $9.99
If the sign contains neon at a pressure of 1.74 torr at 34 celsius, how many grams of neon are in the sign?
If the sign contains neon at a pressure of 1.74 torr at 34celsius, how many grams of neon are in the sign? (The volume of a cylinder is pi*r^2*h.)
A neon sign is made of glass tubing whose inside diameter is 2.5 cm and whose length is 5.5m .
Volume of glass tube in sign
Vol = π*r²*h
Vol = 3.1416 * 1.25²*550
volume = 2,699.8cm³
Make this 2.7 litres
Calculate moles Ne, use equation
PV = nRT
P = pressure = 1.74torr = 1.74/760*101.325 = 0.232kPa
V = 2.7 litres
n = number of moles
R= gas constant 8.314
T = tempertaure = 273+34 = 307K
Substitute:
0.232 * 2.7 = n * 8.314*307
n = 0.6264/ 2,552.4
n = 2.45*10*-4 moles
molar mass Ne = 20.18g/mol
mass Ne = 4.95*10^-3g