DATA SHEET. PROCEDURE A POST-LAB QUESTIONS olatie squid you tested Line (1). 40.

Question

DATA SHEET. PROCEDURE A POST-LAB QUESTIONS olatie squid you tested Line (1). 40.908 410 Rubber Band Aluminum Fol A student fated to vaporize the entire sample prior to placing the tesl tubs in the in tee did this error affect the calolated molar mass? Justity your answer usingcalcations Line (2) 47 Astudent faled to dry the outside of the test tube pror to massing B?Step 12 How dns affect the calculated mciar mass? Justity your answer using calcularions g - Line (2) -Line (1) 00to 213 bath (K) higher, or have no efect on the determined moler

Explanation / Answer

1) the molar mass will be obtained by using ideal gas equation as

PV = nRT

n = moles

R = gas constant = 0.0821 L atm / mol K

T = temperature

P = Pressure

V = volume in litres

Trial 1)

n = PV /RT = 1.0026 X 0.142 / 0.0821 X 373 = 0.00465

Moles = Mass / Molar mass

Molar mass = Mass / Moles = 0.368 / 0.00465 = 79.14 g / ,mole

Trial 2)

n = PV /RT = 1.0026 X 0.158 / 0.0821 X 373 = 0.00517

Moles = Mass / Molar mass

Molar mass = Mass / Moles = 0.206 / 0.00517 = 39.85 g / ,mole

2) It can affect the molar mass in two ways

a) Either the molar mass reported will be too large as the mass of vapors calculated will be too high (the mass of liquid will be included in the mass of vapors) and the molar mass depends on mass as

M = mass X RT / PV

b) Or the molar mass reported will be too small , as volume of vapors will be too high hence

M = mass X RT/PV

3) the molar mass will be too small. as the mass of water calcualted will be high and this will increase volume and

M = mass X RT/PV

Molar mass will be low

4) No effect on the molar mass as all other measured quantity will change accordingly

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