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A mixture of CaCO3 and CaO weighing 0.698 g was heated to produce gaseous CO2. After heating, the remaining solid weighed 0.434 g. Assuming all the CaCO3 broke down to CaO and CO2, calculate the mass percent of CaCO3 in the original mixture.
The pressure inside a particular 5.00 L bottle of gas must be 1 atm or less in order to open the bottle cap. To what temperature, in C, must a bottle of gas be cooled so that the bottle cap can be removed if at 25.0C the pressure is 2070 mm Hg
How many moles of NH4Cl must be added to 1.0 L of 1.0 M solution of NH3 to prepare a buffer solution with a pH of 9.00 ? of 9.50 ? Kb = 1.8 x 10 -5
A 135 mL sample of a 15.0 M ethylene glycol (rm C_2H_6O_2) solution is diluted to 1.50 L.What is the freezing point of the final solution.
(a) What was the molar concentration of acetic acid in the vinegar (b) Assuming the density of the vinegar to be 1.1 g/mL, what was the percent (by mass) of acetic acid in the vinegar
What is the concentration in mol/L of a solution with 8.52g MgCl2 dissolved in 150.0ml of solution. What is the concentration of Mg2+ and Cl- ions.
What is the typical range of Ka and Kb values for weak acids and bases. Which value represents the weakest and which the largest. What would be the pH of solutions 0.1 M in the acid or base at the extremes of the range.
The density of air at ordinary atmospheric pressure and 25°C is 1.19 g/L. What is the mass, in kilograms, of the air in a room that measures 12.5 x 15.5 x 8 ft
A gas occupies 74.12L at 41.2 degrees Celsius and 764 mm Hg. What will be the temperature if the gas is compressed to a volume of 44.27L and a pressure of 1002 MM Hg
a chemistry student has made some stock 0.2 moll potassium permanganate solution. he wants to make 800 ml of 0.04 moll
Which of the following is a use for nuclear energy?
If a solution has a pH = 7.0 and Cd2+ is added to it (the ksp of Cd(OH)2 = 2.5 x 10-14) what molar concentration of cadmium ion is needed for precipitation to occur
What is the pH at the isoionic point? What is the pH at the isoelectric point? Explain the difference between your answers in (a) and (b), including specifically why one result is larger than the other.
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