Molar Conversion

How many molecules are there in 154.5 grams of sulfur dichloride? (Just write the number, don't include any units even though you always should on anything you turn in. Also, if the answer is in scientific notation, write it with the carot symbol and no spaces... for example you should write 6.02 x 10²³ as 6.02x10^23.)

Tags

NGSS.HS-PS1-7

How many formula units of potassium oxide are there in 23.5 grams of potassium oxide? (Just write the number, don't include any units even though you always should on anything you turn in. Also, if the answer is in scientific notation, write it with the carot symbol and no spaces... for example you should write 6.02 x 10²³ as 6.02x10^23.)

Tags

NGSS.HS-PS1-7

Convert 50.0 grams of H₂O to moles of H₂O.

• 901 moles

• 18.02 moles

• 2.77 moles

What mass of calcium chlorate, Ca(ClO₃)₂, is equivalent to 0.750 moles of the substance?

• 155.24 grams

• 206.98 grams

• 128.65 grams

2.50 moles of sodium sulfate, Na₂SO₄, are added to a solution. What mass of the substance was this?

• 297.65 grams

• 142.05 grams

• 355.13 grams

3.0 moles of sodium hydroxide, NaOH, is equal to what mass?

• about 40 grams

• about 23 grams

• about 120 grams

When converting a mass to moles, what unit must be in the denominator of the conversion factor?

• grams

• moles

• grams/mole

176 grams of carbon dioxide, CO₂, is equal to how many moles of the substance.

• about 44 moles

• about 4 moles

• about 1 mole

Tags

NGSS.HS-PS1-7

When converting a moles to mass, what unit must be in the denominator of the conversion factor?

• grams

• moles

• grams/mole

Convert 13.25 grams of magnesium nitrate, Mg(NO₃)₂, to moles of the substance.

• 0.100 mole

• 0.0986 mole

• 0.0893 mole