Unit 4 Chemical Quantities Flashcard Review

Front

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

Back

28.02 g

Front

You would need to multiply ________ by the number of each element inside the parentheses to calculate the molar mass for Mg(NO3)2.

Back

two

Front

Grams (g) alone can be used to describe molar mass.

Back

False

Front

The empirical formula may not represent the ________ composition of an ionic compound, molecular compound, or crystal.

Back

actual

Front

Compared with a mole of gold atoms, a mole of aluminum atoms has:

Back

the same number of atoms.

Front

Define molar mass.

Back

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

Front

What is the formula to calculate the number of moles from mass?

Back

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

Front

What does the term 'empirical formula' mean?

Back

The simplest whole-number ratio of atoms in a compound.

Front

What is the difference between empirical and molecular formulas?

Back

Empirical formula shows the simplest ratio, while molecular formula shows the actual number of atoms in a molecule.

Front

How many atoms are in one mole of any substance?

Back

6.022 x 10^23 atoms (Avogadro's number).