Mole to Mole and Mass to Mass Stoichiometry

If a chemical reaction involving substance A and B stops when substance B is completely used up, then substance B is referred to as the

• excess reactant.

• limiting reactant.

• primary reactant.

• primary product.

Which of the following would be investigated in reaction stoichiometry?

• the types of bonds that break and form when acids reacts with metals

• the mass of potassium required to produce a known mass of potassium chloride

• the amount of energy released in chemical reactions

• the mass of hydrogen and oxygen in water

Tags

NGSS.HS-PS1-7

Which of the following cannot be determined from the pictured equation?

• Moles of a product produced from a given amount of reactant.

• Mass of a product produced from a given amount of reactant.

• Number of atoms or molecules produced from a given amount of reactant.

• The volume of a liquid produced from a given amount of reactant

Tags

NGSS.HS-PS1-7

In solving a mass-mass (gram to gram) conversion, it is necessary to convert to the given mass to moles.

• true

• false

When calculating the molar ratio, we use the

• Coefficients

• Limiting Reagent

• subscripts

• subscripts

What is the molar ratio between hydrochloric acid and hydrogen?

• mol HCl : 2 mol H₂

• mol Zn : 1 mol ZnCl₂

• 2 mol HCl : 1 mol H₂

• 2 mol Zn : 1 mol H₂

What is the molar ratio between oxygen and carbon dioxide?

• 2 C₂H₂ + 5 O₂ -> 4 CO₂ + 2 H₂O

• 10 mol O₂ : 8 mol CO₂

• 5 mol O₂ : 4 mol CO₂

• 1 mol O₂ : 2 mol H₂O

Tags

NGSS.MS-PS1-5

What is the molar ratio between oxygen and magnesium oxide? 2 Mg + O₂ -> 2 MgO

• 2 mol Mg : 2 mol MgO

• 1:2

• 1 mol O₂ : 2 mol MgO

• 2 mol Mg : 1 mol O₂

Tags

NGSS.HS-PS1-7

What is the molar ratio between sodium hydroxide and hydrogen?

• 1 mol NaOH : 1 mol H₂

• 2 mol NaOH : 1 mol H₂

• 1 mol Na : 1 mol H₂

• 2 mol Na : 1 mol H₂

Using the balanced chemical equation:
Mg + 2 HCl --> MgCl₂ + H₂

How many grams of MgCl₂ is produced if 4.67 moles of HCl react?

• 219 g MgCl₂

• 4.67 g MgCl₂

• 94 g MgCl₂

Tags

NGSS.HS-PS1-7