MP3 Ultimate Review (HCHEM)

Front

What is the molecular formula if the empirical formula is C2H5 and the molecular molar mass is 58.14 g/mol?

Back

C4H10

Front

What is the empirical formula for a compound composed of 32.40% sodium, 22.5% sulfur, and 45.1% oxygen?

Back

Na2SO4 * 3H2O

Front

What is produced in a combustion reaction?

Back

H2O + CO2

Front

What is the empirical formula of a compound composed of 64.80% C, 13.62% H, and 21.58% O?

Back

C4H10O

Front

What is the definition of an empirical formula?

Back

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

Front

What is the definition of a molecular formula?

Back

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

Front

What is STP in chemistry?

Back

Standard Temperature and Pressure, defined as 0 degrees Celsius and 1 atm pressure.

Front

How do you calculate the empirical formula from percentage composition?

Back

Convert percentages to grams, divide by molar mass, and find the simplest ratio.

Front

What is the significance of the molar mass in determining molecular formulas?

Back

It helps to determine how many times the empirical formula fits into the molecular formula.

Front

What is the relationship between liters of gas and moles at STP?

Back

1 mole of gas occupies 22.4 liters at STP.