Moles and Molar Mass
What is Avogadro's Number?
6.02 x 1023
Balance the following reaction:
_ H2O2 --> _ O2 + _ H2O
2, 1, 2
What is the difference between oxidation and reduction?
Oxidation = losing electrons (positive charge)
Reduction = gaining electrons (negative charge)
What is the empirical formula for C12H9N18
C4H3N6
Calculate the Molar Mass of Glycerol:
C3H8O3
92.11 g/mol
How many moles of O2 will be formed from 1.65 moles of KClO3?
2 KClO3 --> 2 KCl + 3 O2
2.48 moles O2
In a sample of NaCl, what is the element being reduced?
Cl- - chloride ion
Determine the empirical formula of the compound from its percent composition:
62.6% Ca, 37.4% C
CaC2
How many moles are in 3.4 x 1023 molecules of H2SO4
0.56 moles
Based on the following reaction:
2 H2O --> 2 H2 + O2
If enough H2O is reacted to produce 3.40 moles of H2, then how many moles of O2 must have been made?
1.7 moles O2
In a sample of AlF3, what element is the oxidizing agent?
F- - fluoride ion
Determine the empirical formula of the compound from its percent composition:
52.0% Zn, 9.60% C, 38.4% O
ZnCO3
Aspartame is an artificial sweetener with a molecular formula of C14H18N2O5.
How many atoms of nitrogen are in 1.2 grams of aspartame?
4.91 x 1021
How many grams of O2 are needed to react with 100. grams of butane?
2 C4H10 + 13 O2 --> 8 CO2 + 10 H2O
358 g O2
In the following reaction:
Zn + CuSO4 --> ZnSO4 + Cu
which element is being oxidized?
Zinc (Zn)
A major textile dye manufacturer developed a new yellow dye. The dye has a percent composition of 75.95% C, 17.72% N, and 6.33% H by mass with a molar mass of about 240 g/mol. Determine the molecular formula of the dye.
C15N3H15
How many grams of NaOH (MW = 40.0) are in 150.0mL of a 0.300M NaOH solution?
1.80 g
According to the following reaction, how many moles of Fe(OH)2 can form from 175.0 mL of 0.227 M LiOH solution? Assume that there is excess FeCl2.
FeCl2 (aq)+ 2 LiOH(aq)?--> Fe(OH)2 (s)+2 LiCl (aq)
Give the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of lithium sulfide and copper (II) nitrate are mixed.
2 Li+ (aq) + S2- (aq) + Cu2+ (aq)+2 NO3-(aq) -->?CuS (s) + 2 Li+ (aq) + 2 NO3- (aq)
Determine the molecular and empirical formula for the saran compound, with the percent composition:
24.8% C, 2.0% H, 73.1% Cl
Empirical Formula = CHCl
Molecular Formula = C2H2Cl2