Question

complate the second schedule and pages 137 & 138

Report Form DATA Data is collected in your notebook. 21 Water bath temperature: Barometric Pressure: torr vapor Pressure of Water at the Water bath temperature: LG torr Partial Pressure of Hydrocarbon Experimental Trials Initial Mass of Lighter Final Mass of Lighter Mass of Hydrocarbon Volume of Hydrocarbon a atm atm

Answer 1

1.moles = mass/molar mass

mass/moles =molar mass

2. moles of any substan at STP occupies 22.4 L

moles = mass/molar mass, molar mass = moles/moles

3.

a. mole of any substance occupies 22.4 L at STP

0.033 L correspond to 0.033/22.4 L =0.001473 moles

Moles = mass/Molar mass, molar mass= mass/moles = 0.253/0.001473 g/mole =172 g/mole

b. Molar mass = 0.151/(0.029/22.4) =116 g/mole

c. molar mass = 0.023/(0.080/22.4)= 6.44g/mole

d. Molar mas = 0.131/(0.086/22.4)= 34.12 g/mole

4. g/mole is nothing but molar mass or molecular weight

Average = (172+116+6.44+34.12)/4 =82.14 gm/mole

Standard deviation =

Standard deviation = sqrt(1/4* }(172- 82.14)²+116-82.14)² +(6.44-82.14)² + (34.12-82.14)² =65.68

Relative standard deviartion = 100*65.68/82.14=79.84

4. The deviations between experimental values and average values is significant. Average values is 82.14 g/mole.

5.