OO Verizon LTE 12:14 PM webassign.net Supporting Materials Calculate each of the

Question

OO Verizon LTE 12:14 PM webassign.net Supporting Materials Calculate each of the following quantities for an ideal gas. (See the table of physical data.) (a) the volume of the gas, in liters, if 1.74 mol has a pressure of 1.01 atm at a temperature of -6°C (b) the absolute temperature of the gas at which 3.33 x 10 occupies 408 mL at 719 torr (c) the pressure, in atmospheres, if 0.00284 mol occupies 424 mL at 139°C atm (d) the quantity of gas, in moles, if 126.8 L at 52 C has a pressure of 11.40 kPa Supporting Materials (a) The molecular formula of acetylsalicylic acid (aspirin), one of the most common pain relievers, is C9Hao4. How many moles of C9H8O4 molecules are in a 0.493-g tablet of aspirin? mo (b) How many molecules of C9H8O4 are in this tablet? molecules (c) How many carbon atoms are in the tablet? carbon atoms Supporting Materials Periodic Table

Explanation / Answer

Ideal gas Law PV = nRT (covert all the values in SI units before substituting and calculating)

a) V = nRT/P = 37.9 L

b) T = PV/nR = 1412.7 K

c) P = nRT/V = 0.391 atm

d) n = PV/RT = 0.54 moles

2a) 0.493/(9*12 + 8*1 + 4*16) = 2.74 mmoles or 2.74x10-3 moles

2b) moles x Avagadro's number = .00274x 6.023x1023 = 1.65x1021 molecules

2c) each molecule contains 9 C atoms, so this tablet contains, 9*the no. of molecules = 1.485 x 1022 C atoms.

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