Empirical Formula
a chemical formula of a compound that gives the proportions of the elements present in the compound
What is the empirical formula?
It tells us which atoms and how many of each type of atom are present in a molecule.
What is the molecular formula?
Percent composition of oxygen in CO2
What is 72.7%?
Law of conservation of mass
Mass cannot be created or destroyed in a chemical reaction, only rearranged.
Molar Mass of BaI
What is 391.138 g/mol?
What does the Empirical Formula tell us?
This formula tells us the simplest or most reduced ratio of elements in a compound.
How do we find the percent composition of an element?
The equation for percent composition is (mass of element/molecular mass) x 100.
Percent composition of nitrogen in NH3
What is 82.4%?
Avogadro's number
6.022 x 10^23 particles per mole.
Molar mass of NO
What is 30.01 g/mol?
What do we need to do to know the Moles of an atom?
We need to divide the grams of the element by the molar mass.
TRUE OR FALSE
Does a molecular formula give us structural information?
False molecular formulas do not show how the atoms of the elements are bonded together.
Percent composition of Na in NaNO₂
What is 33.33%?
Difference between an atom and a molecule?
Why is an atom is the smallest component of an element whereas a molecule is made up of two or more atoms?
Empirical formula of C6H12O6
What is CH2O?
What does an empirical formula not tell you?
The empirical formula does not show the actual number of atoms.
The formula that shows the number and kind of atoms which a substance of a molecule contained, is known as.
Chemical Formula
Percent Composition of CO3 in H2CO3
What is 96.75%?
Where do we find the Atomic mass of an Element?
We find it in our periodic table!
Amount of moles in 7630 grams of MgS
What are 135.34 moles of MgS?
What is the empirical formula of a compound containing 60.0% sulfur and 40.0% oxygen by mass?
S3O4
Caffeine has the following composition: 49.48% of carbon, 5.19% of hydrogen, 16.48% of oxygen, and 28.85% of nitrogen. The molecular weight is 194.19 g/mol. Find out the molecular and empirical formula.
C4H5N2O.
Percent Composition of NO3 in Mg(NO3)2
What is 83.53%?
Difference between empirical and molecular formulas?
What is the empirical formula gives the lowest whole-number ratio of the elements in the compound, while the molecular formula gives the actual numbers of atoms of each element in the compound? (closest answer wins)
The molecular formula of a compound that has the empirical formula C2H4O, and its formula mass is 88 g.
What is C4H8O2?