CCU3 Bringing thing together

A graduate student working in an organic lab is given a unknown gas sample and a set of facts about the gas.

How many moles are in the gas sample?

Multiple Choice

What formulas can help us get to moles?

• PV=nRT

• D=m/v

• $$\frac{PV}{T}=\frac{PV}{T}$$

Hotspot

What values do we need?

Multiple Choice

How many moles are in the sample?

• 0.1839

• 5.212

• 0.08923

• 11.20

​What is the mass of the sample?

Hotspot

What 2 values do we need to determine the mass of the sample?

​What is the molar mass of the gas?

Multiple Choice

What is the label for molar mass?

• grams/1 mol

• grams/ 1 atom

• grams/ 1 liter

• mol/1 Liter

​What is the empirical formula of the gas?

Hotspot

What 2 values do we need to determine the empiri of the sample?

Reorder

What is the order to finding empirical formulas?

• Percent to mass

• Mass to mole

• divide by small

• multiply til whole

1

2

3

4

• 1
• 2
• 3
• 4

Multiple Choice

What is the empirical formula?

• CH

• CH₂

• CH₃

• CH₄

• C₂H₅

Multiple Choice

What is the mass of the empirical formula

• 14

• 13

• 12

• 7

Multiple Choice

What is the molecular formula

• C₂H₂

• CH₂

• C₂H

• 2CH

Poll

What do you need more review on?

• thermo-stioich.

• Gas Law

• Concentration and Dilutions

• Empirical Formulas

• a bit of everything