Calculate Molar Mass
What is the molar mass of Fe?
55.45 g/mol
Define an element.
How is an Isotope different from an atom?
different number of neutrons and different atomic mass.
What is the conversion factor from moles to atoms?
Avogadros number 6.022x1023
What is the conversion factor to convert grams to moles?
molar mass
What is the molar mass of H2O?
18 g/mol
Define a compound.
substance that is made of two or more different types of atoms chemically bonded together
How is an Ion different from an atom?
different number of electrons.
How many moles are in 12 atoms of carbon?
=12 moles / 6.022x1023 atoms / mole
How many grams are in 3 moles of sodium chloride (NaCl)?
3 moles x 58.45 g/mole
Calculate the molar mass of Na2CO3?
105.9888 g/mol
Give an example of a mixture.
Air, Lemonade, etc. lots of answers
what is in the nucleus of an atom of Argon-37?
18 protons and 19 neutrons
How many atoms are in 2 moles of water?
2 moles x (6.022x1023 atoms / mole)
If you have 250 grams of magnesium (Mg), how many moles do you have?
250 grams Mg / (24.305 g/mol)
What is the molar mass of C2H5OH
46.068 g/mol
Why is F2 considered a molecule but not a compound?
It is a molecule because it is made of more than 1 atom but not a compound because it is made of 1 type of atom.
What was the outcome on the Rutherford model of the atom after the Thin slit experiment? Why?
The Rutherford model was replaced because it did not have energy levels that the thin slit experiment predicted.
How do you convert moles back to atoms?
what do you put into the calculator?
multiply by avogadros number
moles x 6.022x1023
A compound has a mass of 90 grams when there are 6 moles of it. What is its molar mass?
90 grams / 6 mole = 15 g / mol
Calculate the molar mass of C6H12O6.
180.156 g/mol
What is the difference between a compound and a mixture?
a compound is chemically bonded together but a mixture is two or more compounds not bonded together and can be separated.
what is (1.23x1045 + 2.4x1044 ) / 8.08x106
1.81x1038
Jacques decides to play a play a trick on his sister and asks her which has more animals.
7 moles of mice or 4.215x1024 doves
what should she respond?
bruh they the same
#twins
Johnny reacts 40 grams of aluminum with oxygen and ends with 18 grams of aluminum oxide. After the reaction he is left with 1/4 the amount of aluminum he started with and half that amount in oxygen. How many moles of oxygen does he have left?
5 grams O / (15.999 g/mol)