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Sodium hydroxide comes in a pellet form in bottles from laboratory supply companies but it cannot be used as a primary standard. Why not
Molecules are mobile in a gas and some reactions can be run in the gas phase. Give several reasons solutions are preferable for synthetic reactions.
The resulting solution required 13.73 mL of 0.176 mol L-1 NaOH(aq) to neutralize the excess, unreacted HCl. What was the percentage by mass of Mg(OH)2 in the original sample [Hint: When Mg(OH)2 or A
Calculate the pH of a buffer solution made by mixing 34 ml of a 0.11 M potassium acetate solution with 63 ml of a 0.10M acetic acid solution. Give the pH to two decimal places.
Calculate the pH of a solution resulting from the titration of 50mL of 0.04M HBr with 25 mL of 0.107M KOH. Give your answer to two decimal places
A chemical compound has a molecular weight of 132.05 g/mole. 1.908 grams of this compound un¬derwent complete combustion under constant pressure conditions in a calorimeter with a heat ca¬pa
If HCl concentration is reduced by 50% and the rate is reduced by 25% what is the reaction order? This is assuming the other reactant is at a constant concentration.
32.00mL of a .2500 M sodium hydroxide solution exactly neutralized a solution containing 0.5000 grams of a soluble solid acid that yields two moles of hydrogen ions per mole of acid when dissolved.
What is the pH of a solution resulting from the titration of 50 mL of 0.050 M formic acid solution, HCOOH, with 25 mL of 0.050 M NaOH solution? Calculate your answer to two decimal places.
The following reaction is first order with respect to NO and first order with respect to O2, and the rate constant is 5.0 x 104 M-1s-1. What is the rate of the reaction when [NO] = 0.125 M and [O2]=0
How much heat is required to convert 83 g of nitrogen gas to NO2 at constant temperature and pressure in the presence of excess oxygen
What is the final state of the system after 26.0 kJ of energy is removed from 150.0 g of water at 1 atm. The water has an initial temperature of 20.0?C . Cs(ice) 2.092 J/g?C Cs(water) 4.184 J/g?C ?H
Write the balanced equation and net ionic equation for magnesium sulfate with a solution of sodium phosphate.
calculate the total volume of hydrogen gas which would be collected at 760 mm Hg and 25 degrees celsius. Will a second gas be present in the sample collected by water displacement
When one mole of hydrogen decomposes into H atom the change in enthalpy is 435. 88 kJ/mole. What is the formation enthalpy, ?Hf for hydrogen atom
Solid benzoic acid, C6H5COOH(s), is often used to determine the heat capacity of a bomb calorimeter, because the constant volume heat of combustion of this compound is known with high precision
What type of hybridization (according to valence bond theory) does Fe exhibit in the complex ion, [Fe(H2O)4(Cl)2]+?
a metal sample weighing 37.6 grams, which has been heated to a temp of 100 degree cin boling water was placed in 48.6g of waterin a calorimeter. The inital temp of the water was 25.2 degree c.
The following reaction is first order with respect to NO and first order with respect to O2, and the rate constant is 5.0 x 104 M-1s-1: 2NO(g) + O2(g) --> N2O4(g)
What is the pH of a solution resulting from the titration of 50 mL of 0.050 M acetic acid solution, CH3COOH, with 50 mL of 0.050 M NaOH solution
An elemental analysis shows that it contains 40.0 mass percent C, 6.71 mass percent H, and 53.3 mass percent Oxygen. Remember mass percent = grams. A determine the empirical formula. B. determine th
The following reaction is first order with respect to NO and first order with respect to O2, and the rate constant is 5.0 x 104 M-1s-1
If the test of such a breath sample yields a reading of 0.08%, what are the partial pressure and mole fraction of CH3CH2OH in the breath of the person who was tested? Assume the atmospheric pressure
A sample of 5.53g of Mg(OH02 is added to 25.0mL of 0.200 M HNO3. How many moles of Mg(OH)2, HNO3, and Mg(NO3)2 are present after the reaction