Mole Day Celebration!

Moles & Molecules

100

What is the value of one mole? 

6.022 x 10²³ particles

200

What is the molar mass of 3 NH₃? (ammonia) (must have correct units)

N = 14.01

H = 1.01 * 3 

 = 3 (14.01 + 3.01) = 51.12 g/mole

300

If you have 3 moles of O₂, how many molecules do you have? 

3 moles * (Avagadro's number / 1 mole) = 1.81 x 10^24

400

How many moles are in 24g of carbon? (carbon = 12g/mole)

24 g * (1 mole/12 g) = 2 moles

500

True or false: one mole of copper has the same mass as one mole of gold

False

Stoichiometry

100

N₂ + 3H₂ -> 2 NH₃

If you start with 1.00 moles of N₂, how many moles of NH₃ form? 

2.00 moles

200

2H₂ + O₂ -> 2H₂O

How many grams of water form from 4.00 g H_2?

Use H = 1.02 g/moles 

4.00g * (1mole H2 /2.02 g ) * (2 moles H2O / 2 moles H2) * (18.02 g / 1 mole H2O) = 35.68 grams of water

300

2Na + Cl₂ -> 2NaCl

How many grams of NaCl form from 46g of Na? (Round to the nearest whole number)

Na = 22.99 g/mole

Cl = 35.45 g/mole

46g Na * (1 mol Na /22.99 g Na) * (2 moles NaCl / 2 moles Na) * ( 58.44 g / 1 mole Na ) = 117 g NaCl

400

C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O

If you start with 22 g of propane, how many grams of CO₂ are produced? 

C = 12.01 g/mole

H = 1.01 g/mole

O = 16 g / mole

22 g propane * (1 mole propane / 44.11 g propane) * (3 moles CO2 / 1 mole propane) * (44.01 g CO2 / 1 mole CO2) = 66 g CO2

500

CH₄ + 2O₂ -> CO₂ + 2H₂O

How many grams of CO₂ are produced when 10g of CH4 burns completely? 

C= 12.01

O = 16

H = 1.01

10g CH4 * (1 mole CH4 / 16.05 grams) * (1 moel CO2 / 1 mole CH4) * (44.01 grams CO2 / mole) = 27.5 g CO2

Avogadro!

100

Who was Avagadro? 

Italian scientists who estimated the value of the mole

200

How long does Mole day last?

6:02AM to 6:02 PM

300

What law states that equal volumes of gases at the same temperature and pressure contain equal number of particles?

Avagadro's Law

400

What century was the number estimated in? 

19th 

500

What was Avagadro's previous profession before he became a physicist? 

Lawyer

Math in Chemistry (working with the number)

100

What's 2.5 moles of NaCl in formula units? 

Na = 22.99 g/mole

Cl = 35.45 g/mole

2.5 * Avagadros number = 1.51 x 10²⁴

200

If you have 18.02 g of H₂O, how many moles do you have?

1 mole

300

How many grams are in 0.25 moles of CO₂?

CO₂ = 44.01g/mole

.25 mole CO2 * (44.01 g / 1 mole) = 11 g 

400

How many molecules are in 0.5 moles of NaOH? 

Na = 22.99 g/mole

O = 16g/mole

H = 1.02 g/mole

.5 moles NaOH * (Avagadro's number/1 mole) = 3.011 x 10^23

500

How many grams are in 2.67 x 10¹² formula units of Tungsten?

W = 183.84 g/mole

2.67 x 10¹² f.u. * (1 mole W / Avagadro's number) * (183.84g/1 mole W) = 8.2 x 10^-10