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if 76g of Cr2O3 and 27 g of al completely react to form 51 g of Al2O3 how many grams of Cr are formed?
The half-life of radon-222 is 3.8 days. How much of a 100 g sample is left after 15.2 days?
Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years
Determine the mass of lithium hydroxide produced when 0.38 g of lithium nitride reacts with water to make Ammonia (NH3) and Lithium hydroxide.
Calculate the pH of a buffer formed by mixing 60. mL of 0.10 M lactic acid with 88 mL of 0.24 M sodium lactate.
How many grams of Oxygen gas are required if It is desired to inflate a baggie with 842 milliliters volume by filling it with O2 gas at 1.21 atm pressure and a 306 K.temperature ?
Compute the pH of a solution made by mixing eighty grams of NaCH3COO, to 39 grams of CH3COOH, and adding in H2O to produce 500. mL of solution.
A sample of neon has a volume of 780 mL when it is at a pressure of 751 mmHg. What will be the volume when the pressure is increased to 1389 mmHg?
An alloy, initially weighing 50 grams, contains 90 atomic% silver and 10 atomic% copper. How many grams of copper would have to be added to make the alloy 12 atomic% copper?
A system absorbs 295 kJ of heat and the surroundings do 177 kJ of work on the system. What is the change in internal energy of the system?
Cobalt Chloride in varying concentrations Spectrophotometer set to a Wavelength = 510 nm % Transmission = experiment #1 = 31.62, experiment #2 = 89.13 and experiment #3 = 98.86
A 24.7 g sample of pure iron at 61°C is dropped into 99 g of water at 25°C. What is the final temperature of the water-iron mixture?
Identifying Organic Compounds, A colorless liquid A (C3H6O) was soluble in water and ether, and had a boiling point of 94-96 degrees Celsius. It decolorized a Br2-CH2Cl2 solution and gave a positive ceric nitrate test
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