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A 99.11 g sample of a highly radioactive element is determined to contain 0.4271 mol of the element. What is the element?
a saturated solution of copper(I) chloride, CuCl, has [Cu^+]=1.1x10^-3 M and [Cl^-]=1.1x10^3 M. what is the value of Ksp for CuCl
the world's estimated annual gas reserves in 2006 were 6124 trillion ft3 .The world rate of annual use was 105.5 trillion feet3. How long these reserves will last if the rate of use continues?
What is the chemical equation for the reaction that represents breaking all the bonds in gaseous benzene
How many minutes will it take to plate out 16.22 g of Al Metal from a solution of Al^+3 using a current of 12.9 amps in an electrolytic cell
A buffer is created by mixing equal concentration is NH4+ and NH3. Calculate the volume of both solutions needed to create a buffer of pH = 8.75 with a total volume of 100ml
Assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 C?
The Ka of a certain indicator is 6.0 x 10 ^-6 the color of Hln is green and that of ln- is red. A few drops are added to a Hcl solution, which is then titrated against a NaOH solution. At what pH will the idicator changer colors
a graduated cylinder contains 155 ml of water. a 15.0 g piece of iron density 7.86 and a 20.0 g piece of lead are
If the formation of a Grignard synthesis does not begin spontaneously when Mg metal and a solution of an alkyl halide in either are mixed, one sometimes adds a small amount of iodine to the flask. What substance is formed from the reaction of iodi..
A certain carbon-hydrogen compound contains 84.1% C by mass and the remainder is hydrogen. What is the empirical formula of the compound
understanding of chemistry basics.1. the relative concentrations of reactant and product found when a reaction reaches
Cars were timed by police radar as they passed in both directions below a bridge. Their velocities (kilometres per hour, numbers of cars in parentheses) to the east and west were as follows
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