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Density measurements can be used to analyze mixtures. For example, the density of solid sand (without air spaces) is about 2.84g/mL. The density of gold is 19.3 g/mL. If a 1.00kg sample of sand containing some gold has a density of 3.10g/mL(without air spaces), what is the percentage of gold in the sample?
Draw the product of the following reaction between propanoyl chloride and p-methoxynitrobenzene. Include all formal charges.
A. mass of solvent per liter of solution. B. mass of solute per liter of solution. C. mass of solute per liter of solvent. D. moles of solvent per liter of solute. E. moles of solute per liter of
One of the alkali metals reacts with oxygen to form a solid white substance. When this substance is dissolved in water, the solution gives a positive test for hydrogen peroxide, H2O2.
Find out the Kb of ammonia if the pH of a buffer formed by mixing 50.0 mL of 1.00 M NH 3 and 50.0 mL of 1.00 M ammonium nitrate?
The atmospheric activity of 14 C is 15 cpm/gC (counts per minute per gram of carbon). Assume that the cloth was made in the year 24 B.C. The half-life of 14 C is 5730 years. What will be the expected activity of 14 C of this sample
How many grams of potassium permanganate are needed to decolorize 1g of 2-pentane in basic solution?
seperate two compounds efficiently, what alternatives would one consider to effect clean separation by distillation?
Calculate the urms , uavg , and ump velocities for CH4 at 600. K. The molecular weight of methane is 16.043 g mol-1. Show your cancellations of proper units for at least one calculation
What is the molarity of a solution containing 1.35 mol H2SO4 in 245 mL of solution
What is the value of K for the reaction between hydrocyanic acid and ammonia, which is shown here
Calculate the concentration of all species in a 0.100 M phosphorous acid solution. These species include {H3O}, {H2PO3} and {HPO3^2-}. For phosphorous acid, ka1=3.0*10^-2 and Ka2=1.7*10^-7
A 4.50-g sample of LiCl at 25 C dissolves in 25.0 mL of water also at 25 C. The final equilibrium temperature of the resulting solution is 60.8 C. What is the enthalpy, change of enthalpy, of LiCL expressed in kj per mole?
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