mole/ grams/ particle conversions review

Front

What is the molar mass of one molecule of Nitrogen (N₂)?

Back

28.02 g

Front

How do you calculate the mass of a substance given the number of molecules?

Back

Use the formula: Mass = (Number of molecules / Avogadro's number) x Molar mass.

Front

What is Avogadro's number?

Back

6.022 x 10²³ molecules/mole.

Front

If you have one mole of an element, what does its mass equal?

Back

Its atomic mass from the periodic table, but in grams.

Front

How many atoms are in one molecule of carbon dioxide (CO₂)?

Back

3 atoms (1 carbon atom and 2 oxygen atoms).

Front

What is the formula to convert moles to grams?

Back

Grams = Moles x Molar mass.

Front

What is the molar mass of C₆H₁₂?

Back

The molar mass is 84.16 g/mol.

Front

How many moles are in 456 g of CO₂?

Back

Moles = Mass / Molar mass = 456 g / 44.01 g/mol = 10.36 moles.

Front

What is the mass of 4.20 moles of C₆H₁₂?

Back

Mass = 4.20 moles x 84.16 g/mol = 353 g.

Front

How do you find the number of molecules in a given mass of a substance?

Back

Use the formula: Number of molecules = (Mass / Molar mass) x Avogadro's number.