Unit 7. Stoichiometry (Review)

Mole ratios are obtained from the

• balanced chemical equation
• periodic table
• molar mass

How many step will it take for me to go from moles given to moles unknown?

• 1

• 2

• 3

• 4

How many steps will it take me to go from grams to grams?

• 4

• 3

• 2

• 1

How many step will it take for me to go from grams to moles unknown

• 1

• 2

• 3

• 4

I use molar mass when the problem gives me grams?

• False

• True

I use 6.02 x 10²³ when the problem gives me molecules?

• True

• False

I use mole ratio (coefficients) from balanced chemical equation?

• True

• False

Balance the following reaction :
 
CaC₂(s)   +   H₂O(l)   -->   C₂H₂(g)   +   Ca(OH)₂(aq)

• 1,2,2,2
• 1,2,1,1
• 2,1,1,1
• 2,1,2,1

Cl₂ + 2KBr → Br₂ + 2KCl
How many grams of potassium chloride (KCl) can be produced from 356 g of potassium bromide (KBr)?

• 749 g
• 223 g
• 479 g
• 814 g

N₂ +  3H₂ −->  2NH₃ 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6
• 2
• 3
• 1