3L Stoichiometry Review

If a chemist calculates the maximum amount of product using stoichiometry that could be obtained in a chemical reaction, he or she is calculating the

• theoretical yield
• mole ratio
• actual yield
• percentage yield

Tags

NGSS.HS-PS1-7

What is the measured amount or product, or amount of product recovered in the lab called?

• mole ratio
• theoretical yield
• percentage yield
• actual yield

Mole ratios are obtained from the

• balanced chemical equation
• periodic table
• molar mass

What is the REDUCED mole ratio of H₂O to H₃PO₄ in the following chemical equation?

  P₄O₁₀ + 6 H₂O --> 4 H₃PO₄ 

• 3:2

• 4:6
• 1:3
• 3:1

Tags

NGSS.HS-PS1-7

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂ How many grams of aluminum sulfate would be formed if 250 g H₂SO₄ completely reacted with aluminum? (MM of Aluminum sulfate= 342.15 g; MM of H2SO4= 98.08 g) Watch SF!

• 0.85 g
• 290 g
• 450 g
• 870 g

Tags

NGSS.HS-PS1-7

For the reaction represented by the equation Cl₂ + 2KBr → Br₂ + 2KCl, how many grams of potassium chloride can be produced from 356 grams potassium bromide? ( MM KBr=119.00g ; MM KCl=74.55 g) Watch SF!

• 749 g
• 223 g

• 479 g
• 814 g

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NGSS.HS-PS1-7

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

Identify the limiting reagent when 6.00 g HCl combines with 5.00 g Mg to form MgCl₂. (MM HCl=36.46 g; MM Mg=24.31 g)   Mg +  2HCl --> MgCl₂  +  H₂     

• Mg
• H2
• MgCl2
• HCl

Tags

NGSS.HS-PS1-7

How many grams are in 7.80 moles of NaCl? (Round MM to 0.01 g)

• 476 grams

• 460 grams
• 456 grams

• 462 grams

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