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Consider the reaction MnO2 + 4HCI → MnCl2 + Cl2 + 2H2O. If the both the
reactants have a mass of 100 grams, which of the two will be used up first? How
many grams of MnCl2 will be produced after the reaction? (MnO2 =
86.94 g/mol, HC1 = 36.46 g/mol, MnCl2 = 125.8 g/mol)
______________3. An oxide of chromium is made up of 5.20 g chromium and 5.60 g
oxygen What is the empirical formula of the oxide? (Note: An oxide of nitrogen
contains 63.1% oxygen and has a molar mass of 76.0 g/mol.)
______________4. What is the empirical formula for this compound?
______________5. What is the molecular formula of the compound?
Calculate the pH and pOH of the following solution and identify each solution as acidic, basic or neutral. (with solutions)
1. [H3O+] = 1.0 x 10-9 M
2. [OH-] = 1.0 x 10-8 M
3. [H3O+] = 0.0010 M
4. [OH-] = 0.010 M
Which statements about dilute sulfuric acid are correct?1. 1. It turns red litmus paper blue. 2. It reacts with magnesium(II) oxide to form magnesium(II) sulfate and water. 3. It reacts with magnesium to form magnesium(II) sulfate and carbon dioxide. 4. Its pH is below pH 7
Identify the conjugate base and conjugate acids of each acid and bases
1. HOCl
4. F-
2. H2PO4-
5. HCO3-
3. H2O
6. H2O
. Calculate the following buffer solution using the Henderson-Hasselbalch equation.
1. Calculate the pH of the buffer solution that contain 0.20 M HOCl (Ka= 4.0 x 10-8) and 0.10 M HCl.
2. What is the pH of a buffer solution that contains 0.50 M CH3CO3H (Ka = 1.8 x 10-5 ) and 0.02 M
H2CO3?
A solution is prepared by dissolving 150 ml of isopropyl alcohol in enough water to produce 1.5 ml of rubbing solution.
A. What is the volume percent of alcohol in the solution?
B. What is the proof of the solution?
Balance the equation below:
1. H₂S + NHO₃ S + NO+ H₂O
Determine which element is oxidized and which element is reduced in reactions below (be sure to include the oxidation state of each):
CO32- + 2H+→CO2 + H2O
The major product of the reaction of 1-ethyl-1-cyclohexene and HI is
