Question

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

5 of 30 Review Constants | Periodic Table Part A If the sign contains neon at a pressure of 1.78 torr at 38 °C, how many grams of neon are in the sign? (The volume of a cylinder is wrh) Express your answer using two significant figures. V AEO ? Submit Request Answer Next > Provide Feedback SAA D 5:29 PM 11/2/2014

Answer 1

Answer: m = 0.0050 g

1. Volume of neon gas = volume of cylinder = Moth = 22 x (25 cm) ? x 5.5m = 3:14 * (1-25cm) x (5.5 x180)cm = 2698.4375 cm? Now moles of neon gas is : n= PV RT = 1.78 torr x 2698.43750 82:06 e atmkmm x 38°C = (1.78/160) atin x2698.4375 82.06 ato Kimon'x (38 +273-15) 2 1.78 x 2698.4375 mg 82.06 8 311-158760 = 0.000247524 mot Now , mass of con gas = moles x moar mass = 0.000 247524 ind x 2011 = 0.0049959 = 70.0050 ģ