% Comp/Empirical/Molecular Formulas

Front

What is the percent by mass of oxygen in MgO?

Back

40%

Front

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

Back

Na3PO4

Front

A chemical formula that shows the actual number and kinds of atoms present in one molecule of a compound is called_________

Back

molecular formula

Front

What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?

Back

C6H12O6

Front

What is the percent by mass of sodium in NaCl?

Back

39%

Front

Define empirical formula.

Back

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

Front

Define molecular formula.

Back

The actual number of atoms of each element in a molecule of a compound.

Front

How do you calculate percent by mass of an element in a compound?

Back

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

Front

What is the empirical formula for a compound with a molecular formula of C4H8?

Back

CH2

Front

If the empirical formula of a compound is CH and its molar mass is 78 g/mol, what is the molecular formula?

Back

C6H6