Ch 10: Chemical Quantities Flashcards
You often measure something by one of three different methods:
by count
by mass
by volume
Any mole of any substance contains __________ ______ of representative particles.
Avogadro’s number
Formula for converting number of particles to Moles
Moles = representative particles X 1 mole / 6.02 X 10^23 representative particles.
Formula for converting Moles to number of particles
Representative particles = moles X 6.02 X 10^23 representative particles / 1 mole.
The atomic mass of an element in grams is the ____ of the ____ of the _______.
mass
mole
element
What is equal to the atomic mass in grams?
Molar mass
Calculating the molar mass of a compound: find the number of _____ of each _______ in one mole of the ________. Then ___ the masses of the elements in the compound.
grams
element
compound
add
What is used to convert between the mass of a substance and the moles of a substance?
The molar mass of a substance.
Formula for finding mass from moles.
Mass (g) = number of moles X molar mass (g) / 1 mole.
Formula for finding the number of moles from mass.
Moles = mass (g) X 1 mole / mass (g).
At STP, 1 mol (6.02 X 10^23 representative particles) of any gas occupies a volume of ____ _.
22.4 L
What is the formula for calculating volume of STP?
Volume of gas = moles of gas X 22.4 L / 1 mol.
What is the formula for calculating molar mass from density?
G/mol = g/L X 22.4 L / 1 mole.
What are the particles of an element?
Atoms
What are the particles of a molecular compound?
Molecules
