Molar Mass
What are the units for molar mass?
g/mol
What is a conversion factor?
a ratio of equivalent values used to express the same quantity in different units
How do you know conservation of mass is observed in a chemical equation?
If there are the same number of atoms of each element on the reactants and the products side.
OR
If the reactants total mass=products total mass
How many moles of K, C, and O atoms are there in 1 mol of K2C2O4?
2 mol K atoms, 2 mol C atoms, and 4 mol O atoms
What are the SI units for measuring length, volume, and mass?
meters, liters, and grams
OR
in their common prefixes:
cm (centimeter), mL (milliliter), and kg (kilogram)
What is the molar mass of C6H6?
78 g/mol
How many molecules of H2O are in 18.0 mol H2O?
1.08x1025 molecules
Balance the following equation:
_KClO3(s)-->_KCl(s) + _O2(g)
2KClO3(s)-->2KCl(s) + 3O2(g)
Detemine the number of mol of Al3+ ions are in 1.25 mol Al2O3?
2.50 mol Al3+
What does the EE button on a calculator stand for?
x10__
What is the molar mass of CuSO4?
159.6 g/mol
Conversion factors help to convert from one unit to another by using their equivalence. These fractions are the same as multiplying by ____.
AKA
1mol/6.02x1023 particles= ___
AKA
for Na: 23g/mol=___
1
Balance the following chemical equation:
_C2H4+_O2-->_CO2+_H2O
C2H4+3O2-->2CO2+2H2O
What is the ratio of KClO3 to O2?
2KClO3(s)-->2KCl(s) + 3O2(g)
2KClO3:1
OR
2 KClO3/3O2 also written as 3O2/2 KClO3
What university did Mrs. Guzman go to for her Bachelor's degree?
UC San Diego
Determine the percent composition of Fe in Fe2O3?
69.94% O
What conversion factor(s) would you use to go from atoms to grams?
mol/6.02x1023 atoms and molar mass g/mol
Balance the following chemical equation:
_F2 + _H2O → _HF + _O2
2F2 + 2H2O → 4HF + O2
How many grams of Al3+ are in 1.25 mol Al2O3?
6.75 g Al3+
How many times does Beyonce say "Texas" in her new song "Texas Hold 'em"?
3
Analysis of a compound composed of iron and oxygen yields 174.86 g of Fe and 75.14 g of O. What is the empirical formula for this compound?
Fe2O3
Relationships between coefficients can be used to write conversion factors called __________
Mole Ratios
Freebie!
500 points!
Give a mole ratio between two compounds in the chemical equation:
C2H4+3O2-->2CO2+2H2O
Mrs. Guzman will check
Watch the color mixing video, will it create blue or green?
green