Butane Lab (M) Name_______________________pd_____
Purpose: Collect butane, observe properties, use measurements to calculate density and moles of butane.
Procedure:
1. mass dry lighter
2. collect gas as demonstrated
3. dry light as demonstrated, remass
4. bring butane to fume hood as demonstrated, clean up
Data:
1. mass before _____g
2. mass after _______g
3. volume of butane _____mL = _____L
4. temperature of butane (same as water) ______ C = ______ K
5. pressure (read barometer) _______cm Hg = _______ mm Hg
6. ideal gas law constant ‘R’ from p 384 (choose the one for mmHg)
Calculations:
1. mass of butane (subtraction) _______ - _______ = ________g
2. density of butane (mass/volume) _______ / _______ = ___________g/mL
3. molar mass of butane C4H10 (add at mass) = _______ + _______ = ____________g/mole
4. moles of butane in lab (mass/molar mass) _______ / _______ = _________ mole
5. moles of butane using # 3, 4, 5 from the data and the ideal gas law (PV=nRT) _______*______ = n * ______ * _________ ; n = _________ mole
Conclusions:
1. Are calculations #4 & 5 close? ______ Which do you think is the most accurate? _______ Why?_____________________________________________________________
2. What can cause a mistake in this lab?_____________________________________________
3. 3 properties of butane are __________________, ________________ and ________________
4. Is butane more or less dense than air? ______________ What is your evidence?_______________________________________________________________
5. The butane is in the _________ state inside the lighter, but in the ___________ state outside the lighter because _________________________________________________________
6. What does the word volatile mean? _______________________________________________
7. Rank water, butane, oil, and alcohol from most to least volatile. 1______________2_________________ 3________________ 4________________
8. The common name of the black smoke is ___________, and it is made of the element _________.
9. Butane __________ (is or isn’t) soluble in water. The evidence is______________________________________________________________
10. Butane, propane and methane are all alike because_____________________________________________________, but they are different because___________________________________________________________________________