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what is the mass percent of the helium in a mixture that has an equal number of He and CH4 molecules?
1.10%
2.20%
3.25%
4.50%
5.80%
How many grams of the element nickel are contained in 10.0g of a 10.2 wt% solution of nicke sulfate hexahydrate, NiSO4*6H2O?
What volume will 5.6 moles of Sulfur hexafluoride (SF6) gas occupy if the temperature and pressure of the gas are 128 deg C, and 9.4 atm
How many grams sodium chloride (mol wt = 58.4g/mole) are needed to make 550 mL of a 1.90 M aqueous solution of sodium chloride
An enzyme-catalyzed reaction produces a product that has a maximum absorbance at 412nm. The extinction coefficient is 4000M^-1cm^-1, A l0 to-l dilution of the enzyme is made and 20 u.L of the dilution are put into a cuvette with 80 ul of water and..
Calculate the observed rotation for a solution of a substance (2.0g/mL) that is 80% optically pure. A 2-dm cell is used. The specific rotation for the optically pure substance is +20o.
What is the key intermediate in the glycolysis pathway that diverges to ethanol in microorganisms. Why is the concentration of ethanol in wine typically 12% or less
Qualitatively, describe how an acid-base indicator works. Why do we want to use a minimum amount of indicator in a titration? Select all that apply.
Write an ionic and net ionic equation for the following reaction between Fe3+ and NH3(aq)
Nylon is a synthetic polymer made up of amide linkages formed when a diacid condenses with a diamine. The different types of nylons are identified by the number of carbons possessed in the diamine
The process of water freezing to form ice at 0 degrees C is a. neither exothermic nor endothermic. b. an endothermic phase change. c. an exothermic chemical reaction. d. an exothermic phase change. e. an endothermic chemical reaction.
At equalibrium, it was found that the concentration of H2 was 0.0584 M, the concentration of N2 was 0.0195 M and the concentration of NH3 was 0.430 M. What was the initial concentration of ammonia
what mass of Fe (OH)3 would be produced by reacting 75.0 mL of a 0.0815M Fe( NO3)3 solution with 125 mL of a 0.150 M NaOH solution
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