empirical and molecular formula

what is formula mass?

mass of a compound expressed in amu

ex. C₂H₆O

mass of 2 C = 2 × 12.01 amu

mass of 6 H = 6 × 1.008 amu

mass of 1 O = 1 × 16.00 amu

= 46.07 amu

what is molar mass?

mass of 1 mol of compound in grams

ex. C₂H₆O

mass of 2 C = 2 × 12.01 g

mass of 6 H = 6 × 1.008 g

mass of 1 O = 1 × 16.00 g

= 46.07 g

what is formula mass?

mass of a compound expressed in amu

ex. C₂H₆O

mass of 2 C = 2 × 12.01 amu

mass of 6 H = 6 × 1.008 amu

mass of 1 O = 1 × 16.00 amu

= 46.07 amu

what is molar mass?

mass of 1 mol of compound in grams

ex. C₂H₆O

mass of 2 C = 2 × 12.01 g

mass of 6 H = 6 × 1.008 g

mass of 1 O = 1 × 16.00 g

= 46.07 g

what is the difference in units between formula mass and molar mass?

formula mass is amu while molar mass is g

formula mass and molar mass is the same number sometimes

true or false

true

how do you find the mass percentage of an element?

mass of element in 1 mol compound/mass of 1 mol compound x 100%

Find the mass percentages in epibatidine (C₁₁H₁₃ClN₂)

C: 63.31%

H: 6.279%

Cl: 16.99%

N: 13.43%

what is empirical formula?

shows the relative number of different types of atoms in a compound

also the simplest possible formula for a compound

what is a molecular formula and how does it differ from an empirical formula?

it represents the actual numbers of the atoms in a molecule while the empirical formula basically represents the simplified version

ex. empirical formula: C₃H₇, molecular formula: C₆H₁₄

empirical formula: NO₂, molecular formula: N₂O₄