Quiz 3 Material (Avogadro's Number) Flashcards
what is a mole?
a collection that contains 6.022 x 10^23 of an element
Avogadro’s Number
6.022 x 10^23 atoms
__ mole of any atom is ___
one; avogadro’s number
a mole of a covalent compound has
avogadro’s number of particles
a mole of an ionic compound contains
avogadro’s number of formula units
avogadro’s number is used to convert ___ to ___
moles of a substance, particles
how many Cu atoms are in 0.50 mole of Cu?
3.0 x 10^23 Cu atoms
how many moles of CO2 are in 2.50 x 10^24 molecules of CO2?
4.15 moles of CO2
how many atoms are in 2.0 moles of Al?
1.2 x 10^24 atoms Al
how many moles of S are in 1.8x 10^24 atoms of S?
3.0 moles
the subscripts in a formula give…
the relationships of atoms in the formula, and the moles of each element in 1 mole of a compound
how many moles of C, H, and O are in one moles of C9H8O4?
9 moles C
8 moles H
4 moles O
how many O atoms are in 0.150 mole of aspirin (C9H8)4)? explain.
3.61 x 10^23; multiply moles aspirin by moles O, then multiply by Avogadro’s number
formula weight
sum of the atomic weights of all the atoms in a compound
how do we calculate formula weight?
multiply the number of atoms in each element by the atomic weight and add the results
molar mass
the mass of one mole of any substance (atomic weight)
define the molar mass of potassium
39.10 g/mol
define the molar mass of Sn
118.71 g/mol
define the molar mass of CaCl2
110.98 g/mol
what is the molar mass of Prozac (C17H18F3NO)?
309.29 (answer may be slightly off due to decimal differences
which compounds must be simplified when possible?
ionic compounds, NOT molecular
how many grams of Al are in 3.00 moles of Al?
81.0 g of Al
how many moles of aspartame (C14H18N2O5) are present in 225 g of aspartame?
0.765 mol
to get to grams of an element/compound from moles of an element or compound, we must
use the molar mass
to get to atoms/ions or molecules/formula units from moles, we must
use avogadro’s number
