Molar Mass, Percent Composition, and Mole Calcs PRACTICE

How many oxygen atoms are in MgCO₃?

• 2

• 3

• 5

• 6

Tags

NGSS.MS-PS1-1

How many H atoms are in (NH₄)₃PO₄?

• 4

• 7

• 12

• 15

Tags

NGSS.MS-PS1-1

How many oxygen atoms are in Mg(NO₃)₂?

• 2

• 3

• 5

• 6

Tags

NGSS.MS-PS1-1

What is the definition for Avogadro's number?

• number of grams per one mole of a substance

• whole number ratio that is a multiple of a chemical formula

• simplest, whole number ratio of a chemical formula

• 6.02 x 10²³ particles per one mole of a substance

Which would have more atoms?

• 1 mole of Li
• 1 mole of Au
• 1 mole of Si
• None, all are equal

Tags

NGSS.MS-PS1-1

Molar mass is in units of ________.

• grams
• grams/mole
• mole
• moles/gram

Tags

NGSS.HS-PS1-7

What is the molar mass of AuF₃? (work needed)

• 610. g/mol

• 130 g/mol

• 253.9 g/mol

• 303.3 g/mol

What is the molar mass of Ca(NO₃)₂? (work needed)

• 148.10 g

• 164.09 g

• 102.06 g

• 70.08 g

Calculate the molar mass of magnesium hydroxide (work needed).

• 33.2 g/mol

• 41.3 g/mol

• 86.9 g/mol

• 58.3 g/mol

Tags

NGSS.HS-PS1-7

What is the percent by mass of Br in CuBr₂? (work needed)

• 50%

• 71.6%

• 28.4%

• 44.3%