stoichiometry

stoichiometry

Multiple Choice

If 55.6 grams of calcium carbonate react in excess sodium hydroxide, how many grams of Na2CO3 are made?

Reaction: CaCO3 + NaOH → Ca(OH)2 + Na2CO3

• 147.34 gram

• 52.45 gram

• 55.9 gram

• 194.24 gram

Multiple Choice

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

• True

• False

Multiple Choice

I use molar mass when the problem gives me grams?

• False

• True

Multiple Choice

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

• 1

• 2

• 3

• 4

Multiple Choice

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

• 4

• 3

• 2

• 1

Multiple Choice

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

• 1

• 2

• 3

• 4

Multiple Choice

In the equation 2Al₂O₃ → 4Al + 3O₂, what is the mole ratio of aluminum to oxygen?

• 10:6

• 3:4

• 4:3

• 2:3

Multiple Choice

___KNO₃ → ___KNO₂ + ___O₂

What coefficients are needed to balance the reaction?

• 2, 2, 1

• 2, 3, 2

• 1, 2, 2

• 1, 3, 1

Multiple Choice

Given the equation:

2NaClO₃ (s) → 2NaCl (s) + 3O₂ (g)

When 2.00 moles of NaClO₃ react, how many grams of O₂ is produced?

• 56 g of O₂

• 96 g of O₂

• 64 g O₂

• 32 g O₂

Multiple Choice

Identify the limiting reagent when 6.00 g HCl combines with 5.00 g Mg to form MgCl₂.
 
Mg +  2HCl --> MgCl₂  +  H₂   
 

• Mg
• H2
• MgCl2
• HCl

Multiple Choice

When does a chemical reaction stop?

• When the lab is finished
• When the excess reactant is used up
• When the limiting reactant is used up
• Chemical reactions never stop

Multiple Choice

CH₄ + 2 O₂ → CO₂ + 2 H₂O
How many moles of carbon dioxide are produced from the combustion of 110 g of CH₄?

• 13.7 mol
• 2.75 mol
• 6.11 mol
• 6.85 mol

Multiple Choice

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

• 749 g
• 223 g
• 479 g
• 814 g

Multiple Choice

 SiO₂ + 3C → SiC + 2CO
I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?

• _{96 g}
• 0.67 g
• 2.67 g
• 48 g

Multiple Choice

2Na + 2H₂O → 2NaOH+ H₂
How many grams of hydrogen are produced if 120 g of Na are available?

• 5.2 g
• 2.6 g
• 690 g
• 45 g