Mole conversions
What is Avogadro's number?
6.02 X 1023 particles, molecules, ions, atoms
What does percent composition tell you?
Percent composition tells you by mass what percent of each element is present in a compound.
What type of formula shows the simplest whole-number ratio of atoms in a compound?
Empirical Formula
The molecules/chemicals that are produced from a chemical reaction are called...
Products
A + B --> AB
Synthesis
How many moles are in 72.9 g of HCl?
1.999 mol
Find the percent composition of copper(Cu) in CuBr2.
28.4%
What type of formula shows the number of each type of atom in a molecule?
Molecular formula
The most important thing to know about balancing chemical equations is that the number of atoms in the ___________ should equal the number of atoms in the ___________.
reactants, products
How many reactants does a decomposition reaction have?
1
How many moles of nitrogen are there in 4.3 × 1023 molecules?
0.714 mol
What is the percent composition of nitrogen in the compound (NH4)2S?
41.2%
A compound with an empirical formula of CFBrO has a molar mass of 253.8 grams per mole. What is the molecular formula of this compound?
C2F2Br2O2
Balance this equation... N2 + H2 --> NH3
1N2 + 3H2 --> 2NH3
What type of reaction?
SnCl2 + Zn -> ZnCl2 + Sn
Single Replacement
How many grams of SO2 are 4.5 × 1024 molecules?
478.93 g
What is the percent composition of oxygen in the compound, Al2(SO4)3?
56.1%
A certain blue solid contains 36.84% N and 63.16% O. What is the empirical formula of this compound?
N2O3
Balance this equation... KClO3 --> KCl + O2
2KClO3 --> 2KCl + 3O2
What type of reaction?
KCl + AgNO3 -> KNO3 + AgCl
Double Replacement
How many particles are in 720 g of C6H12O6?
2.406 x 1024 particles
What is the complete percentage composition (by mass)of all elements in potassium acetate (CH3CO2K)?
H: 3.08%, C: 24.248%, O: 32.60%, K: 39.84%
A sample of indium chloride weighing 0.5000 g is found to contain 0.2404 g of chlorine. What is the empirical formula of the indium compound?
InCl3
Balance this equation.... C3H8O + O2 --> CO2 + H2O
2C3H8O + 9O2 --> 6CO2 + 8H2O
What are the 2 products in a combustion reaction?
CO2 and H2O