Mole Concepts
What is a mole
6.02 x 1023
how many moles are in 6.02 x 1023 particles?
1 mole
What is the formula for percent composition?
Part/whole x 100
88.8% copper; 11.2% oxygen
Cu2O
What particles pertain to which type of chemicals (hint theres 2)
atoms for elements and molecules for compounds.
Who discovered the mole and the concept behind it?
Amodeo Avogadro
how many grams are in 2.5 moles of nitrogen?
35g N
Percent of hydrogen in water?
11% hydrogen in H2O
30.4% nitrogen; 69.6% oxygen
NO2
How many atoms of Hydrogen are in (NH4)2O
8
Which has the most particles?
5 moles oxygen
5 moles iron
5 moles lead
all the same
How many particles are in .043 moles of Neon?
2.6 x 1023 atoms Ne
Percent bromine in CuBr2
72% bromine
38.7% chlorine; 61.3% fluorine
ClF3
what is the molar mass of FeSO4
152 grams/mole FeSO4
which has the least amount of particles?
5 grams of oxygen
5 grams of iron
5 grams of lead
5 grams of lead
How many grams are in 5.0 x 1023 particles of Calcium?
33 grams of Calcium
Percent of Sodium in NaOH
57.5% Sodium
6.01 grams of carbon was heated and produced 38.01 grams of a carbon and oxygen gas. What is the empirical formula?
CO4
20 grams of a hydrate is heated and weighed after heating. It weighs 12 grams AFTER heating. What is the % composition of the hydrate?
40% H2O
equal volumes of gas have the same number of particles no matter what the elements or compound is who's law?
Avogadro's law
how many particles are in .0005 grams of Arsenic?
4.0 x 1018 atoms As
Percent Hydrogen in (NH4)2S
12% Hydrogen
A compound with the following composition has a molar mass of 60.10g/mol: 39.97% carbon; 13.41% hydrogen; 46.62% nitrogen. Find the molecular formula.
C2H8N2
Dopamine is the chemical in your brain that controls positive emotions in your brain. The formula is C8H11NO2 whats is the molar mass?
153 grams per mole