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1. When 19 mL of a solution containing .29 M Ca(OH)2 is diluted to 30 mL, a dilute solution is formed. What is the OH- concentration in 15 mL of the dilute solution?
2. When 30 mL of a 135 mL stock solution containing 1 M AlCl3 is diluted to 61 mL, what is the concentration of Cl- in the new solution?
A 4.00 g sample of an aluminum-copperalloy reacts with excess hydrochloric acid. The 2.81 L of H2(g) produced is collected over water at a barometric pressure of 758.4 mmHg and 19°C. What is the mass percent of aluminum in the alloy
What is the partial pressure of ethane P ethane , in the flask? Express your answer to three significant figures and include the appropriate units
Oxygen-15 has a half-life of 124 seconds. You begin with a 429 mg sample of oxygen-15. You wait 6.20 minutes. What is the total amount of time in seconds
The best reagent or sequence of reagents for carrying out transformation A and transformation B are
A gas is allowed to expand at constant temperature from a volume of 2.0L to 11.2 L against an external pressure of 0.750 atm. If the gas absorbs 128 J of heat from the surroundings
Write complete and balanced net ionic equations for the reaction that occurs between the following pairs of reagents. If no reaction occurs, so state.
A compound gave an orange precipitate when reacted with 2,4 -DNP and showed a strong absorbance. The Tollens test shows a negative result
Suppose that 24 g of each of the following substances is initially at 25.0^circ C. What is the final temperature of each substance upon absorbing 2.45 kJ of heat?
nitric acid is usually purchased in concentrated form with a 70.3% HNO3 concentration by mass and a density of 1.14% g/ml. How much of the concentrated stock solution in milliliters should you use to make 2.5L of 0.500 M HNO3.
The excess I3- was titrated with 50.00 mL of a 0.02000 M Na2S2O3 solution. What was the mass percent of arsenic trichloride in the original sample?
A drop of NaOH titrant adheres to the side of the buret (due to a dirty buret) between the initial and final reading for the titration. As a result of the "clean glass" error, will the molar concentration of the NaOH be reported too high or too lo..
consider the following equation that describes the complete combustion of propane.nbspthe bond energies are c-h 416
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