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Determine the density of air in grams per liter at a temperature of 20.5 deg. C and a pressure of 755 mmHg. Assume that air is approximately 20% O2 and 80% N2 (i.e. the mole fraction of oxygen is 0.20 and the mole fraction of nitrogen is 0.80)
Given that the concentration of the most dilute solution is 2.57*10 \(-6\) M. Determine the concentration of the original HBr stock solution
a 22.0 kg gold bar at 25.5degc is placed in a large insulated 0.800 kg glass container at 15.0degc with 2.00 kg of
An empty flask weighs 252.2 grams. When filled with water ( d= 1.00 g/cm3) the flask and its contents weigh 591.8 g)
How many kilograms of sodium fluoride would be needed to treat a 8.00 x 10^7 gal reservoir
a substance has a specific heat capactiy of 2 jg c. how many joules are needed to raise the temperature of 30 g of this
You place ethanol of 100 grams and water of 100 grams in a refrigerator. both are at room temperature Initially,. Determine which of the two liquid samples will cool faster and also explain why this happens.
hard water is caused by the presence of dissolved salts. one ofthe main components is caco3. when hard waterevaporates
Technetium-99m is used for radioisotope-guided surgical biopsies of certain bone cancers. A patient must receive an injection of 28mCi of technetium-99m 6-12 hours before surgery.
Predict whether or not the ionic compound AX is likely to form. In this compound, A forms the A+ cation, and X forms the X?anion.
the radioisotope argon-41 is used to measure the rate of the flow of gases from smokestacks. it is a gamma emitter with
After combining the hexane extracts as well as evaporating the hexane he had 0.49 g of crystals. Explain what is the theoretical yield and percent recovery
A 1.80 M solution of 56 ml is diluted to a volume of 218 milliliters a portion of that solution of 109 milliliters is diluted using 149 milliliters of H2O. determine the final concentration of this solution
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