Stoichiometry Review

5C + 2SO₂ --> CS₂ + 4CO

How many moles of CS₂ are produced when 2.7 mol C reacts? (Question 3a)

• 0.54 mol CS₂

• 1.4 mol CS₂

• 3.8 mol CS₂

• 0.97 mol CS₂

Tags

NGSS.HS-PS1-7

A student calculates the theoretical yield to be 12.7 g H₂O. When she performs the lab, she collects 8.40 g H₂O. What is the percent yield? (answer to the tenths place)

(a)  

Tags

NGSS.HS-PS1-7

How many conversion factors are needed to answer this question: 25.00 g of O₂ are produced. How many moles of water reacted?

2H₂O --> 2H₂ + O₂

• 1

• 2

• 3

5C + 2SO₂ --> CS₂ + 4CO

(a)   grams of CS₂ (MM: 76g/mol) form at the same time that 0.25 mol of CO (MM: 28 g/mol) forms. (Question 3c--answer to the tenths place)

Q + Z --> D

Q is the excess reactant. What is the limiting reactant?

• Q

• Z

• D

What is the answer to 2b on the review?

• 12

• 15

• 18

• 9

HBr + LiOH -> H₂O + LiBr

A student mixes 200 g HBr with 200 g LiOH. Which reactant is limiting? (question 5b on the review)

(a)  

Tags

NGSS.HS-PS1-7

P₂O₅ + H₂O --> H₃PO₄

What is the coefficient of water when the above equation is balanced? (question 6 on review)

(a)  

Tags

NGSS.HS-PS1-7

The answer to 4a on the review is: (a)   g NH₃.

(answer with correct sig figs)

Tags

NGSS.HS-PS1-7

5 F₂ + 2 NH₃ -> N₂F₄ +6 HF

What should be written on the bottom of the mole to mole ratio needed to convert moles of HF to moles of F₂?

(a)