Molar Mass of an Unknown Hydrocarbon

Refer to the procedures in your lab handout. What is the purpose of briefly immersing the lighter in water prior to weighing it?

What was the partial pressure of the collected butane gas?

• 759.2 torr

• 18.1 torr

• 741.1 torr

• 777.3 torr

In our lab handout, what was used in place of the index card?

(a)  

Refer to the lab handout. How many mL of gas were we required to dispense?

• 95-100

• 6-7

• 70-100

• 85-100

Refer to the lab handout. Is there a step that indicates that the water inside and outside the graduated cylinder should match prior to taking the volume reading? (a)  

• NO
• YES

How many moles of butane were collected, given the pressure, volume, and temperature of the gas?

• 0.0039 mol

• 0.0965 mol

• 0.22 mol

• 0.0009 mol

What mass of butane was dispensed from the lighter during the experiment?

• 0.22 g

• 14.99 g

• 14.77 g

• 0.18 g

What is the experimental molar mass of butane based on the collected data?

• 58.12 g/mol

• 56.35 g/mol

• 44.00 g/mol

• 28.05 g/mol