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A mixture of cuso4 * 5H2O MgSO4 * 7H2O is heated until all the water is lost. If 5.020 g of the mixture gives 2,988 of the anhydrous salts, what is the percent by mass of cuso4 * 5H20 in the mixture?
degress C in boling water and then dropped the hot coins into 43.0 g of water at a temperature of 15.5 C in a coffee cup calorimeter. The final temperature of the water and the coins was 21.5 C.
solid sodium react violently with water producing heat hydrogen gas and sodium hydroxide. how many molecules of
A portable photometer with a linear response top radiation registered 83.2 microamps with a blank solution in the light path. Replacement of the blank with an absorbing solution yielded a response of 451 microamps calculate
Zinc is used to make galvanized iron pipes. These pipes are protected from the rust reactions that would normally occur. Which statement best explains why zinc is used
A 0.100 M solution of a certain weak acid, HA, is found to have a pH of 2.45. Calculate the % ionization for the acid. Enter the answer as a decimal number with 3 decimal places. Do not enter the units.
a reaction has an activation energy of 195 kjmol. when the temperature is increased from 200 c to 220 c the rate
What are the proper names for each of the pieces of glassware commonly used in distillation. In distillation, how is a column different than a condenser? How is a fractionating column different than a plain column
What mass of Al2O3 in grams can be made by reaacting 4.6 g AL with excess oxygen?
if a gas is at 2.3 atm of pressure and occupies 32 L of volume, how much volume will it occupy if the pressure is lowered to 1.5 atm?
If a student determined that the circumference of a balloon filled by the boiling point of liquid nitrogen was 45 cm, what volume of nitrogen gas has been generated?
Population ratio between two energy levels is 0.98. The space between the energy level is 0.625 meV. What is the system's temperature?
If 23.7 grams of an aqueous solution of barium bromide, BaBr2, contains 6.00 grams of barium bromide, what is the percentage by mass of barium bromide in the solution?
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