How many moles are in 2.91 X 1022 atoms of He
0.0483 moles
0.444 mol of CoCl2 in 0.654 L of solution
0.679 M
CuBr2
Cu: 28.4%
Br: 71.6%
A compound is 92.3% carbon and 7.7% hydrogen
CH
Formula for Density
D=M/V
How many moles are there in 24.0 grams of FeF3
.2127mol
Formula for Molarity
M=mols/L
HCl
H: 3%
Cl:97%
The simplest form of a chemical compound
Empirical Formula
Avogadro Number
6.022X 1023
How many molecules are in 2.00 moles of H2O?
1.20x1024 molecules H2O
98.0 g of phosphoric acid, H3PO4, in 1.00 L of solution
1.00 M
NaOH
Na: 57.5%
O: 40.0%
H: 2.5%
A compound has a molecular mass of 54 and an empirical formula of C2H3. what is the molecular formula?
C4H6
Density of calcium with a mass of 45g and a volume of 12L
3.75
How many grams are there in 7.40 moles of AgNO3?
1256.87 g
0.2074 g of calcium hydroxide, Ca(OH)2, in 40.00 mL of solution
0.06998 M
(NH4)3PO4
N: 28%
H: 8%
O: 43%
P: 21%
What is the molecular formula of a compound with the empirical formula of P2O5 and mass of 284
P4O10
What number on the element square do we use to help us find moles
Mass number or bigger number
How many atoms are in 1.50 moles of Hg
9.03x1023 atoms Hg
A 2.00-L bottle of a solution of concentrated HCl was purchased for the general chemistry laboratory. The solution contained 868.8 g of HCl. What is the molarity of the solution?
11.9 M
N: 41.1%
H: 11.8%
S: 47.1%
(NH4)2S
A compound Contains 40% Ca, 12% C and 48% O by mass. What is the empirical formula
CaCO3
what type of forces hold water molecules together
Hydrogen bonding