Mole & Conversions Flashcard PREVIEW

Front

What is the name of the ionic compound Cr(NO₂)₃?

Back

chromium III nitrite

Front

What percentage of the total atomic mass of magnesium bromide (MgBr₂) is composed of magnesium?

Back

13%

Front

What is the molar mass of oxygen gas (O₂)?

Back

32.00 g/mol

Front

How many grams are in 2.50 moles of oxygen gas (O₂)?

Back

80.00 g

Front

How many moles of sodium chloride are in a 321.8 g sample?

Back

5.507 moles

Front

What is the conversion factor for moles to particles?

Back

1 mol = 6.02x 10²³ particles

Front

Define molar mass.

Back

The mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

What is Avogadro's number?

Back

6.02 x 10²³, the number of particles in one mole of a substance.

Front

How do you calculate the number of moles from mass?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

What is the formula for calculating the percentage composition of an element in a compound?

Back

(mass of element in 1 mole of compound / molar mass of compound) x 100.