Vocabulary
Mole?
The Sl base unit of a substance
How many moles are equal to 1.20 x 10^24 atoms of sulfur?
9.03 x 10^23 atoms S
Mg(CO3)
84.32 grams
What is the percent of Mg in MgO?
60.31%
What is the empirical formula for a compound that is 83.7% carbon and 16.3% hydrogen?
CH2
Avogadro's Number?
6.02x10^23
How many moles are equal to 3.52 moles of oxygen difluoride?
2.12 x 10^24 molecules OF2
What is the units you use for finding molar mass?
Grams
What is the first step in finding percent composition?
Finding the molar mass
What is the empirical formula for a compound that is 7.70% carbon and 92.3% chlorine?
CCl4
Percent Composition?
Indicates the makeup of a substance based on mass (mass of element/mass of compound x 100)
What is the first step to any of these equations?
Putting your known quantity along with its units.
What is added together to find the molar mass?
The atomic mass of each individual element.
What is the percent of O in H2O?
89%
What is the empirical formula for a compound that is 67.6% mercury, 10.8% sulfur, and 21.6% oxygen?
HgSO4
Molar Mass?
the mass of a sample of a compound divided by the amount of substance in that sample. (measured in moles)
How many atoms are equal to 1.5 moles of helium?
9.03 x 10^23
Ba(H2O)
155.34g
What is the percent of Ba in BaN?
91%
What is the empirical formula for a compound that is 94.1% oxygen and 5.90% hydrogen?
O6 H6
Empirical Formula?
a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.
How many formula units are equal to 1.8 moles of magnesium iodide?
1.0836 x 10^24
Li(PH4)
41.95g
What is the percent of Li in LiCl?
16%
What is the empirical formula for a compound that is 50.8% zinc, 16.0% phosphorus, and 33.2% oxygen?
Zn3 P2 O8