Definitions
What is a compound?
a chemical substance composed of two or more different elements
Determine the molar mass of the following compound:
CH3COOH
and double jeopardy, name that ion!
59.04 g/mol
Acetate
What is Avogadro's number?
6.022x10^23
Calculate the number of molecules in 2.02 moles of NaOH.
1.22 x 10^24 molecules of NaOH
What is a mole?
SI base unit for the amount of a substance, representing 6.022 x 10^23 molecules
Calculate the number of moles in 40g of HCO3.
0.7 moles of HCO3
What is molar mass?
mass of 1 mole of a substance (element or compound), expressed in grams per mole (g/mol)
Determine the number of molecules in a 20.0g sample of methane (CH4).
7.53 x 10^23 molecules of methane
Substance A (20 g/mol) and Substance B (25 g/mol) have the same mass of 100g. How does the molar mass affect the number of moles in the given mass of these two different substances?
Because they have fixed molar masses based on their formulas, the amount of substance in the same mass of two different compounds (that have two different formulas) differ.
Determine the number of moles of oxygen atoms in 1 mole of carbon dioxide.
2 moles of oxygen atoms