Stoichiometry Review

4 NH₃ + 7O₂ --> 4 NO₂ + 6 H₂O

The balanced equation shows that 1.00 mole of NH₃ requires ___ mole(s) of O₂.

• 0.57

• 1.25

• 1.33

• 1.75

• 3.5

Tags

NGSS.HS-PS1-7

2CH₃CHO + 5O₂ --> 4CO₂ + 4H₂O

The equation indicates that ___ mole(s) of O₂ are required for each mole of CH₃CHO.

• 1

• 2

• 2.5

• 3

• 5

What is the total mass of products formed when 16 g of CH₄ is burned with excess oxygen?

• 32 g

• 36 g

• 44 g

• 62 g

• 80 g

Tags

NGSS.HS-PS1-7

C₃H₈ + 5O₂ --> 3CO₂ + 4H₂O

Then equation indicates that ____ moles of O₂ are required for each mole of C₃H₈.

• 1.5

• 3

• 3.5

• 5

• 8

Balance the following equation with the smallest whole number coefficients possible. Select the number that is the sum of the coefficients in the balanced equation.

KClO₃ --> KCl + O₂

• 3

• 5

• 6

• 7

• 8

Tags

NGSS.HS-PS1-7

Calculate the mass of hydrogen formed when 27 g of aluminum reacts with excess hydrochloric acid according to the balanced equation below.

2 Al + 6 HCl --> 2 AlCl₃ + 3 H₂

• 1.5 g

• 2.0 g

• 3.0 g

• 6.0 g

• 12 g

How many grams of nitric acid can be prepared from the reaction of 138 g of NO₂ with 54.0 g H₂O according to the equation below?

3NO₂ + H₂O --> 2HNO₃ + NO

• 92

• 108

• 126

• 189

• 279

Tags

NGSS.HS-PS1-7

Which of the following is true?

I. The molar mass of CaCO₃ is 100.1 g/mol.

II. 50 g of CaCO₃ contains 9 X 10²³ oxygen atoms.

III. A 200 g sample of CaCO₃ contains 2 moles of CaCO₃.

• I only

• II only

• III only

• I and III only

• I, II, and III

How many grams of water will be formed when 32.0 g hydrogen is allowed to react with 16.0 g of oxygen according to: 2 H₂ + O₂ --> 2 H₂O?

• 9.00 g

• 16.0 g

• 18.0 g

• 32.0 g

• 36.0 g

Tags

NGSS.HS-PS1-7

A given sample of some hydrocarbon is burned completely and it produces 0.44 g of CO₂ and 0.27 g of H₂O. Determine the empirical formula of the compound.

• CH

• C₂H_3

• CH₂

• C₂H₅

• CH₃