Write the word or phrase that best completes each statement or answers the quest
ID: 706285 • Letter: W
Question
Write the word or phrase that best completes each statement or answers the question. Show all calculations for full marks. 16) Monochloroethene is used to make polyvinylchloride (PVC). It has a density of 2.56 g/L at 22.8 °C and 756 mmHg. What is the molar mass of monochloroethene? 16) Monochloroethene is used to make polyvinylchloride (PVC). It has a density of 2.56 g/L at 22.8 °C and 756 mmHg. What is the molar mass of monochloroethene?16) Monochloroethene is used to make polyvinylchloride (PVC). It has a density of 2.56 g/L at 22.8 °C and 756 mmHg. What is the molar mass of monochloroethene?
Explanation / Answer
We know , P * M = d * R * T. -------(1)
P = Pressure in atm , M = molar mass (g/mol)
d = density ( g/L) , R = gas constant = 0.082 atm L mol-1K-1
T = Temperure in Kelvin
P = 756 mmHg = 756 atm / 760 = 0.9947 atm
d = 2.56 g/L, T = 22.8 oC = (22.8 + 273.15) K = 295.95 K
From (1)
0.9947 atm * M = 2.56 g/L * 0.082 atm L mol-1K-1 * 295.95 K
0.9947 * M = 62.126 g/mol
M = 62.126 g/mol / 0.9947 = 62.46 g/mol
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