Chem 1405 Equations
How do you solve for grams?
given grams X mole(g) of element / molar mass of compound (total g)
Volume %=
vol of solute/vol of solution X100
How do you round moles for Empirical formal and molecular formula?
you want to get the decimal of a number to equal a whole number.. Example # 2: (can be used on any number) 2.0=2 2.1=2 2.2 - X5 2.3- X3 2.4- X5 2.5- X2 2.6- X3 2.7-X4 2.8- X5 2.9= 3 3.0 =3
When do mmhm and atm equal each other?
760 mmhg and 1 atm
How do you find moles when given only molecules?
# of molecules in compound X 1 mol/ 6.022X10^23 = Total mol of compound
How do you solve for % Yield
% Yield = actual yield/theoretical yield X100
How can you tell which element has the highest ionization energy?
1. DECREASES as you go Down the group 2. INCREASES across the period from left to right
How Can you tell which element has the greatest atomic size (radius)?
1. DECREASES from Left to Right across the period 2. INCREASES down the period
How can you tell which element is most metallic?
1. INCREASES as you go down group 2. DECREASES across the period Right to Left
STANDARDS
1. T= 0c = 273 K 2. P= 1 atm 3. 1 mol of any gas = 22.4 L 4. 1 mole = 6.022x10^23 5. 1 mole of an element = atomic mass of an element
How do you solve for Empirical Formula?
1. total % of element / mass of element = mole 2. mole of element / smallest element 3. Use mole ratio to find Emp. Formula
How do you solve for Molecular formula?
1. total % of element / mass of element = mole 2. mole of element / smallest element 3. Use mole ratio to find Emp. Formula 4. use n= molar mass of composition/ molar mass of empirical formula 5. multiply "n" by empirical formula compounds
How do you turn C into F?
1.8(C)+32
How do you solve for molecules?
1.mass X 1 mol/molar mass= total mole 2. total mole x 6.022x10^23/1 mol= Total molecule
How do you turn C into K?
C+273
Dilution Equation (percent concentration)
C1V1=C2V2
How do you turn F into C
F-32/1.8
Dilutions Equation (molarity)
M1V1=M2V2
How do you solve for mass %?
Mass%= Total mass of element /molar mass of compound X100 * need to do this per element*
Daltons Law
P-total = P1 + P2 + ....... Pn
Combined gas law ( Boyle and Charles)
P1V1/T1 = P2V2/T2
Boyle's Law
P1V1=P2V2 ( inverse relationship)
Ideal Gas law
PV=nRT - must convert Volume to L - must convert pressure to atm
What do the symbols in Q=MCDT stand for?
Q- Amount of heat M- Mass C- Specific heat (normally given) DT- change in temp, Tfinal- Tinitial
How do you solve for the Rate of Reaction?
Rate= Change in concentration/ Change in time
Avogadro's law equation
V1/n1 = V2/n2 -only if temp and pressure are constant
Charles Law
V1T2=V2T1 OR V1/T1 =V2/T2
In a Dilution Equation how do you find the volume?
V= n/M
Mass Volume %=
mass of solute/ Volume of solution X 100
Mass %=
mass of solute/mass of solution X100
How do you get mass?
mass= mole X Molar Mass
Molarity=
moles of solute/ volume of solution (L)
Where can you find the number of moles in an element?
the atomic mass
