percent composition
the percent by mass of each element in a compound
percent by mass
mass of element/mass of compound x 100%
empirical formula
a chemical formula showing the ratio of elements in a compound rather than the total number of atoms
molecular formula
A chemical formula that shows the number and kinds of atoms in a molecule, but not the arrangement of the atoms.
What is the number of moles in 9.63 L of H2S gas at STP?
0.430 mol
To determine the formula of a new substance, one of the first steps is to find the
percent composition
If 60.2 grams of Hg combines completely with 24.0 grams of Br ti form a compound, what is the percent composition of Hg in the compound?
71.5%
The lowest whole-number ratio of the elements in a compound is called the
empirical formula
The ratio of carbon atoms to hydrogen atoms to oxygen atoms in a molecule is dicyclohexyl maleate is 4 to 6 to 1. What is the molecular formula if its molar mass is 280g
C{16}H{24}O{4}
What is the mass in grams of 5.90 mol C{8}H{18}
673 grams