Review on Stoichiometry

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

• 6

• 2

• 3

• 1

Tags

NGSS.MS-PS1-5

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

• 5.3 g

• 2.6 g

• 690 g

• 45 g

Tags

NGSS.HS-PS1-7

Look at the "Before" picture of your given reactants. Balance the equation and determine from the picture which reactant is your limiting reactant.

• H₂

• O₂

• H₂O

• The reactants run out at the same time.

Tags

NGSS.HS-PS1-7

CH₄ + 2O₂ --> 2H₂O + CO₂
What is the mass of CO₂ can be produced when 35g of O₂ reacts? 

• 09 g

• 24.1 g

• 28.2 g

• 44.0 g

Tags

NGSS.HS-PS1-7

N₂ + 3 H₂ → 2 NH₃

How many moles of NH₃ can be formed from 1.00 mole of H₂?

• 4.00 moles

• 0.333 moles

• 0.667moles

• 6.00 moles

Tags

NGSS.HS-PS1-7

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from  6 moles H₂? 

• 4 moles Fe

• 6 moles Fe

• 9 moles Fe

• 2 moles Fe

Tags

NGSS.HS-PS1-7

The limiting reactant

• slows the reaction down

• is used up first

• is the reactant that is left over

• controls the speed of the reaction

Tags

NGSS.HS-PS1-7

Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.

• 16%

• 116%

• 85%

• 76%

Tags

NGSS.HS-PS1-7

A reaction was predicted to produce 32.4 grams of a compound. When the product was measured, there were only 26.1 grams made. What is the percent yield?

• 80.6%

• 6.3%

• 24.1%

• 58.5%

Tags

NGSS.HS-PS1-7

Which is the limiting reactant if equal grams of H₂ and Cl₂ react? (if this is hard for you to imagine, make up a number for your grams and work the problem!)

• H₂

• Cl₂

• HCl

• Neither

Tags

NGSS.HS-PS1-7