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Empirical and Molecular Formula
STP
Mole
Molar Volume
Avogadro
100
A formula giving the proportions of the elements present in a compound but not the actual numbers or arrangements of atoms.
What is the empirical formula?
100
Standard conditions temperature and pressure.
What does STP stand for?
100
6.02x10^23
What is Avogadro's Number?
100
Volume occupied by one mole of a substance at a given temperature and pressure. It is equal to the molar mass divided by the mass density.
What is molar volume?
100
Relationship between the masses of the same volume of different gases (at the same temperature and pressure) corresponds to the relationship between their respective molecular weights
What is Avogadro's law?
200
A chemical formula based on analysis and molecular weight.
What is the molecular formula?
200
273K 0 degrees celsius or 32 degrees farenheit
What is standard temperature?
200
*Unit to measure the amount of a substance whose number of particles is the same as the number of atoms of carbon in exactly
What is a mole?
200
Stoichiometry
How do you do molar volume conversions?
200
Between 6:02 AM and 6:02 PM on October 23
What is Mole Day?
300
Start with the number of grams of each element, given in the problem. If percentages are given, assume that the total mass is 100 grams so that the mass of each element = the percent given.Convert the mass of each element to moles using the molar mass from the periodic table. Divide each mole value by the smallest number of moles calculated. Round to the nearest whole number. This is the mole ratio of the elements and isrepresented by subscripts in the empirical formula. If the number is too far to round (x.1 ~ x.9), then multiply each solution by the same factor to get the lowest whole number multiple.
How do you find the empirical formula?
300
101.3kPA
What is standard pressure in pascals?
300
Number of atoms you are given divided by Avogadro's number, 6.02 x 10^23
How do you convert from atoms to moles?
300
Vm
What is the symbol for molar volume?
300
Physics and mathematics
What did Avogadro study in his early 20's?
400
Finding the molecular formula is only possible if you are given the molar mass of the compound. When you have the molar mass you can find the ratio of the actual mass of the compound to the empirical mass. If the ratio is one (as with water, H2O), then the empirical formula and molecular formula are the same. If the ratio is 2 (as with hydrogen peroxide, H2O2), then multiply the subscripts of the empirical formula by 2 to get the correct molecular formula.
How do you find the molecular formula?
400
22.4L of volume
How much space does one mole of gas occupy at STP?
400
Molar mass is the mass in grams of 1 mole of a substance. To calculate molar mass you take the sum of the atomic number of an atom of molecule then just put it into grams
What is molar mass?
400
Vm=M/P
What is the equation to find molar volume?
400
Johann Josef Loschmidt
Who first recognized Avogadro's number?
500
The empirical formula has the smallest whole number for their subscript whereas the molecular formula is the actual number of molecules or atoms in a compound
What is the difference between the empirical and the molecular formula?
500
P1V1/T1 =P2V2/T2
What is the combined gas law?
500
To simplify the amount of a substance because atoms are very small and there are so many of them it would be nearly impossible to count them
Why do we use moles?
500
22.4L/mol at 0 degrees celsius
What is the molar volume of a gas at 1 atmosphere of pressure?
500
Theoretical gas composed of a set of randomly moving, non-interacting point particles
What is an ideal gas?