Stoichiometry Moles

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

• true

• false

What is the conversion factor between mole and atoms?

• 1 mole = 6.022 x 10²³ atoms/particles

• 1 atom = 6.022 x 10²³ moles

• 1 mole = molar mass of the given substance

• 1 gram of the substance = molar mass of the substance

When balancing a reaction,

• we can add elements to the reaction

• We can change the coefficients

• We can change the subscripts

• We can change the subscripts

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

Tags

NGSS.HS-PS1-7

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?

• mol NaOH : mol H₂

• 2 mol NaOH : 1 mol H₂

• 1 mol Na : 1 mol H₂

• 2 mol Na : 1 mol H₂

Tags

NGSS.HS-PS1-7

What the are units for molar mass?

• grams/mole

• atoms/mole

• grams/atoms

• mloes/atom

What is the molar mass of CO₂?

• 40.01 L/g

• 40.01 g

• 44.01 g/atom

• 44.01 g/mol

What is the mole ratio of H₂O to H₃PO₄ in the following chemical equation?   P₄O₁₀ + 6 H₂O --> 4 H₃PO₄ 

• 6:4

• 4:6

• 1:3

• 3:1