Moles to Mass and Mass to Moles

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

In solving a mass-mass (gram to gram) conversion, it is necessary to convert to the given mass to moles.

• true

• false

Tags

NGSS.HS-PS1-7

What is the conversion factor between mole and grams?

• 1 mole = 6.022 x 10²³ grams

• 1 gram of the substance = molar mass of the substance

• 1 atom = 6.022 x 10²³ moles

• 1 mole = 6.022 x 10²³ atoms/particles

What the are units for molar mass?

• grams/mole

• atoms/mole

• grams/atoms

• mloes/atom

Tags

NGSS.HS-PS1-7

How many moles are in 19.82 g Mg?

• 1.23 mol Mg

• 481.70 mol Mg

• 1.00 mol Mg

• 0.82 mol Mg

Determine the mass of 4.20 moles of C₆H₁₂

• 354 g

• 84 g

• 337 g

• 421 g

How many grams are in 1.2 moles of Neon?

• 0.05 grams

• 16.6 grams

• 21.2 grams

• 24 grams

Use the given the chemical equation to answer the following question: 2C₂H₆ + O₂ → 4CO₂ + 6H₂O What does the number 4 represent for the formula unit 4CO2 ?

• The number 4 represents the coefficient, which is also equal to the number of grams of the formula unit above.

• The number 4 represents the subscript, which is also equal to the number of moles of the formula unit above.

• The number 4 represents the coefficient, which is also equal to the number of moles of the formula unit above.

• The number 4 represents the subscript, which is also equal to the number of grams of the formula unit above.

How many grams of NH₃ would result in 8 moles of NH_3. What does the the number 8 do to the molar mass of the compound?

• The number 8 is added to the molar mass to give 25 g/mol.

• The number 8 multiplies the molar mass by 8 to give 136 g/mol.

• The number 8 divides the molar mass by 8 to give 2.13 g/mol.

• The number 8 does not change the molar mass of the compound.

Tags

NGSS.HS-PS1-7