Chapter 8a Quiz : Percent yield, Empirical Formula

What is the formula for percent yield?

• $\frac{Actual}{Theoretical}\times100$
  

• $\frac{Theoretical}{Actual}\times100$
  

• $\frac{Actual\times Theoretical}{100}$

• $\frac{100}{Actual\times Theoretical}$

Tags

NGSS.HS-PS1-7

Which of the following reactions has the lowest percent yield?

• Theoretical yield 25.7 g; actual yield 23.2 g

• Theoretical yield 42.1 g; actual yield 39.9 g

• Theoretical yield 18.2 g; actual yield 15.6 g

• Theoretical yield 93.4 g; actual yield 87.9 g

Tags

NGSS.HS-PS1-7

2Fe₂O₃ + C → Fe + 3CO₂

Ezra adds 28 grams of carbon. He finds the actual yield to be 181.2 grams of CO₂. What is the percent yield of CO₂? (Hint: calculate theoretical yield of CO₂ first)

• 58.83%

• 308.0%

• 64.35%

• 15.50%

Tags

NGSS.HS-PS1-7

What is the empirical formula for P₂O₆?

• P₂O₆

• PO

• PO₃

• P₃O

Tags

NGSS.MS-PS1-1

What is the molecular formula for a compound with the empirical formula: K₂SO₄ and a molecular mass of 696g.

• K₂SO₄

• K₈SO₁₆

• K₈S₄O₈

• K₈S₄O₁₆

A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________

• ionic formula
• covalent formula
• empirical formula
• molecular formula

Which of the following could be a molecular formula with the empirical formula of CH₂O?

• CH₂O₂

• CHO

• C₃H₅O₃

• C₂H₄O₂

Tags

NGSS.MS-PS1-1