Moles Stoichiometry

How many moles of (NH₄)₂O are present in 74.9 g?

• 3,907.0 moles

• 1.44 moles

• 0.79 moles

What is the first thing you must do to solve a stoichiometry problem?

• Write a Balanced Equation

• Panic

• Write an Unbalanced Equation

What is the molar mass of NaCl?

• 58.45g/mol

• 28g/mol

• 6.02 x 10²³

The mass of one mole of an element is equal to

• its atomic number from the periodic table, but in amus.

• its atomic mass from the periodic table, but in amus.

• its atomic mass from the periodic table, but in grams.

Tags

NGSS.HS-PS1-7

6.022 x 10²³ indicates

• A Number

• Avocado's number

• Al's numbert

• Avogadro's Number

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?

• mole = 6.022 x 10²³ atoms/particles

• atom = 6.022 x 10²³ moles

• mole = molar mass of the given substance

• gram of the substance = molar mass of the substance

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 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