unit three Flashcards
the sum of all the atomic masses in its chemical formula
formula mass
molar mass is expressed in ?
g/mol
1 mole of any substance equals
6.02 x 10^23 particles of that substance
how to find percent composition of an element
element molar mass/compound molar mass x 100(%)
percent by mass of all elements in a compound
percentage composition
what tells us the stoichiometry of reactants and products in an equation
coefficients
how to do mass-mass stoichiometry
mass of given to moles of given to moles of wanted to mass of wanted
how to find percent yield
actual yield/ideal yield x 100
addition/subtraction with significant figures
answer should have the same number of decimal places as the limiting term
how many joules is in one calorie
4.184 J
how to calculate theoretical yield
grams to mol to mol to gram
multiplication/division with significant figures
number of significant figures in answer should have same number of SF as number with LEAST amount of SF
how to calculate actual yield
g actual/100 x g ideal
what are the STP conditions
0 degrees celsius,1 atm, 22L/mol
identify each element of pv=nRT
p = Pressure
v = Volume (in liters)
n = number of moles
R = gas constant (0.0821 or 62.4)
T = temperature (in Kelvin)
1 atm equals ??
760 torr
how to convert celsius to kelvin
C degrees + 273.15
how to convert fahrenheit to celsius
(F - 32)/1.8
characteristics of gases
gasses can be compressed, expanded, have low densities, may be mixed in a fixed volume, and exert pressure uniformly in all directions
force exerted on a unit area
pressure
what affects the pressure of gas
volume, temperature, and amount of gas
what is the ideal gas law
PV = nRT
boyle’s law
P1V1 = P2V2
charle’s law
V1/T1 = V2/T2
