Molar Mass and Percent Composition

What is the mass percentage of Carbon in Carbon dioxide (CO₂)?

• 27.27%

• 42.86%

• 72.73%

• 72.72%

Tags

NGSS.MS-PS1-5

What is the molar mass of fluorine gas, F₂?

• 18.998 g/mol

• 38 g/mol

• 9 g/mol

• 18 g/mol

What is the definition of molar mass?

• number of grams in 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 10^23 particles per one mole of a substance

Tags

NGSS.HS-PS1-7

What is the molar mass of AuCl₃?

• 96 g

• 130 g

• 232.5 g

• 303.3 g

What is the mass in grams of 5.90 mol C₈H_18?

• .0512 g

• 19.4 g

• 673 g

• 389 g

Find the molar masses of the following compounds:

• 303.3 g/mole

• 102.9 g/mole

• 74.1 g/mole

• 160.0 g/mole

• 96.0 g/mole

The mass of one mole of substance is called...

• molecular mass

• mole constant

• molar mass

• atomic weight

Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?

• C₂H₃O₂

• CH₂O

• C₂H₄O₂

• C₃H₈O₃

Tags

NGSS.HS-PS1-7

What is the mass of one mole of aluminum?

• 27 g

• 13 g

• 54 g

• 14 g

Calculate the molar mass for Al(OH)₃

• 78.0 g/mol

• 72 g/mol

• 28 g/mol

• 25 g/mol