Regents: Stoichiometry Test Review

Given the balanced equation:

What is the total number of moles of CO₂ formed when 20. moles of HCl is completely consumed?

• 5.0 mol

• 10. mol

• 20. mol

• 40. mol

Tags

NGSS.HS-PS1-7

Which formula is an empirical formula?

• CH₄

• C₂H₆

• C₃H₆

• C₄H₁₀

What is the percent composition by mass of hydrogen in NH₄HCO₃ (gram-formula mass = 79 grams/mole)?

• 5.1%

• 6.3%

• 10.%

• 50.%

What is the empirical formula of a compound that has a carbon-to-hydrogen ratio of 2 to 6?

• CH₃

• C₂H₆

• C₃H

• C₆H₂

Given the balanced equation representing a reaction:

Which type of reaction is represented by this equation?

• synthesis

• decomposition

• single replacement

• double replacement

Tags

NGSS.HS-PS1-7

What is the empirical formula for a compound with the molecular formula C₆H₁₂Cl₂O₂?

• CHClO

• CH₂ClO

• C₃H₆ClO

• C₆H₁₂Cl₂O₂

Given the balanced equation representing a reaction: 2H₂ + O₂ → 2H₂O + energy Which type of reaction is represented by this equation?

• decomposition

• double replacement

• single replacement

• synthesis

A compound has the empirical formula CH₂O and a gram-formula mass of 60. grams per mole. What is the molecular formula of this compound?

• CH₂O

• C₂H₄O₂

• C₃H₆O

• C₄H₈O₄

The gram formula mass of NH₄Cl is

• 22.4 g/mole

• 28.0 g/mole

• 53.5 g/mole

• 95.5 g/mole

The molar mass of Ba(OH)₂ is

• 154.3 g

• 155.3 g

• 171.3 g

• 308.6 g