Review-Molar Mass, Percent Composition, Mol Conversion

What is the percentage of OH^– in Ca(OH)₂?

• 45.9%

• 75%

• 66.6%

• 90.1%

What is the mass of 3.35 moles of sulfur trioxide?

• 335 g

• 268 g

• 245 g

• 64 g

Tags

NGSS.HS-PS1-7

How many moles are there in 425.0 g of sodium chloride?

• 9.835 mol

• 8.126 mol

• 7.272 mol

• 6.691 mol

What is the mass of 5.55 moles of carbon monoxide?

• 155 g

• 143 g

• 138 g

• 122 g

What is the gram formula mass of Silicon Tetrabromide?

• 107.99 g/mol

• 347.70 g/mol

• 187.89 g/mol

• 267.80 g/mol

What is the molecular weight of iron (III) nitrate?

• 145.847 g/mol

• 117.854 g/mol

• 241.8 g/mol

• 85.854 g/mol

The mass % of aluminum in aluminum sulfate is:

• 12.93%

• 45.70%

• 7.89%

• 35.94%

• 15.77%

The molar mass of potassium phosphate is:

• 212.27 g

• 251.37 g

• 86.07 g

• 173.17 g

• 196.27 g

The mass % of H in methane (CH₄) is:

• 75%

• 92%

• 25%

• 4%

• 6%

In solving a mol conversion problem, you are asked to convert 25 grams of CO₂ to total atoms. How many formulas would you use to do this conversions?

• One

• Two

• Three

• More that I can imagine. Perhaps to infinity and beyond.

Tags

NGSS.HS-PS1-7