Empirical and Molecular formulas

Front

What is an empirical formula?

Back

An empirical formula represents the simplest whole-number ratio of the elements in a compound.

Front

What is a molecular formula?

Back

A molecular formula shows the actual number of atoms of each element in a molecule of a compound.

Front

How do you determine the empirical formula from mass data?

Back

1. Convert the mass of each element to moles. 2. Divide by the smallest number of moles to find the ratio.

Front

Given 42.07g Na, 18.89g P, and 39.04g O, what is the empirical formula?

Back

Na3PO4

Front

How many Carbons 'C' are in C18H34O3?

Back

18

Front

Which pair has the same empirical formula: NaCrO4 and Na2Cr2O7, or C2H4O2 and C6H12O6?

Back

C2H4O2 and C6H12O6

Front

What is the empirical formula of a substance with a molar mass of 180g/mol and an empirical formula of CH2O?

Back

C6H12O6

Front

If the empirical formula is CF2 and the molecular formula mass is 192 g/mol, what is the molecular formula?

Back

C4F8

Front

How do you convert an empirical formula to a molecular formula?

Back

1. Calculate the molar mass of the empirical formula. 2. Divide the molecular mass by the empirical mass. 3. Multiply the subscripts in the empirical formula by this ratio.

Front

What is the significance of the empirical formula in chemistry?

Back

It provides a simplified representation of the composition of a compound, useful for understanding its basic structure.