Stoichiometry, Gas Laws, Solutions - UNIT TEST REVIEW

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

• theoretical yield

• actual yield

• mole ratio

• percentage yield

What is the mole ratio of H₂O to H₃PO₄ in the following chemical equation?   P₄O₁₀ + 6 H₂O --> 4 H₃PO₄

• 6:4

• 4:6

• 1:3

• 3:1

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

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

• Magnesium

• Hydrogen gas

• Magnesium chloride

• hydrochloric acid

How many grams are in 7.8 moles of NaCl?

• 476 grams

• 460 grams

• 455 grams

• 462 grams

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

Fe (s) + S (l) --> FeS (s)  

In the experiment above, 7.62 g of Fe are allowed to react with 8.67 g of S.
How much FeS is formed?

• 14.8 g

• 12.2 g

• 13.7 g

• 19.9 g

If i begin with 20 grams of lithium hydroxide, but I end up with 6 grams of lithium chloride, what is my percent yield?

LiOH + KCl → LiCl + KOH 

• 16.9%

• 1.88%

• 5.91%

• 12.3%

Complete the equation for the percent yield of a chemical reaction:
Percent yield=(________)÷(________)×100%

• actual yield ; theoretical yield

• theoretical yield ; actual yield

How many particles are in 13.5 grams of Beryllium?

• 1.5 particles

• 9 particles

• 4x10²³ particles

• 9x10²³ particles