Stoichiometry Unit Test

What is used to convert between grams and moles?

• Avogadro’s number

• Molar mass

• 6.022 x 10^23

• Mole ratio

The Mole Ratio comes from _______ and is used to convert between ________.

• Periodic table, grams to moles

• Balanced chemical equation, moles of two different molecules

• Avogadro’s number, ions to moles

• Balanced chemical equation, moles to grams

The molar mass of a compound is found by:

• adding the atomic numbers

• multiplying by 6.02 X 10²³

• adding up the masses of all the atoms

• multiplying the atomic mass by Avogadro’s number

What is the molar mass of Carbon Tetrachloride (CCl₄)?

• 35.453 g/mol

• 83.49 g/mol

• 47.46 g/mol

• 153.82 g/mol

When the equation below is balanced, what is the mole ratio of Sodium (Na) to Sodium sulfide (Na₂S)?

____Na + ____ K₂S → ____K + ____ Na₂S

• 1:1

• 1:2

• 2:2

• 2:1

Tags

NGSS.HS-PS1-7

There are 6.022 x 10²³ atoms in a mole

• True

• False

The amount of atoms in a mole varies by element

• True

• False

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

• Write a Balanced Equation
• Panic
• Write an Unbalanced Equation
• Ask for help

Tags

NGSS.HS-PS1-7

KNO₃ --> KNO₂ + O₂
What coefficients are needed to balance the reaction?

• 2, 2, 1
• 2, 3, 2
• 1, 2, 2
• 1, 3, 1

Tags

NGSS.HS-PS1-7

WO₃ + H₂ --> W + H₂O
What coefficient goes in front of H₂?

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-7