Stoichiometry and Percent Yield

The amount of product that actually forms when a chemical reaction is carried out in a laboratory is called the _________ yield.

• actual

• theoretical

• percent

Tags

NGSS.HS-PS1-6

C₃H₈ + 5 O₂ →3 CO₂ + 4 H₂O     
a)  If I start with 5 grams of C₃H₈, what is my theoretical yield of water?

• 8.2 grams

• 2.0 grams

• 11 grams

• 5.6 grams

Tags

NGSS.HS-PS1-7

TiS + H₂O → H₂S + TiO 
b. What is my percent yield of titanium(II) oxide if my actual yield is 22 grams and I started with 20 grams of titanium (II) sulfide?

• 137.5%

• 113.6%

• 18.18%

• 45.45%

A chemical reaction stops before the limiting reagent is used up.

• True

• False

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?

• 749 g

• 225 g

• 479 g

• 814 g

Tags

NGSS.HS-PS1-7

What is the first thing you must do to solve a stoichiometry problem?

• Write a Balanced Equation

• Panic

• Write an Unbalanced Equation

• Avogadro's Number

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

• 2,1,1,1

• 2,1,2,1

• 1,2,1,1

• 1,2,2,2

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

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂
How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with aluminum?

• 0.85 g

• 290 g

• 450 g

• 870 g

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

A student burns 1.50 mol C₃H₈ according to the following reaction:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

How many grams of carbon dioxide are produced?

• 44.0 g

• 66.1 g

• 132 g

• 198 g

Tags

NGSS.HS-PS1-7