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A lab chemist used gravimetric analysis to determine the lead content in a pond near a battery manufacturing plant. A 500 mL sample of water from the pond was treated with an excess of sodium sulfide (Na2S) solution. If 0.2560g of lead (II) sulfide (PbS) was obtained from the sample. What was the concentration of lead in the pond? If the acceptable level is 0.001 g/L, is the water from the pond within the acceptable level?
a balloon is filled to a volume of 7.00x102 ml at a temperature of 20.0 degrees c. the balloon is then cooled at
The equilibrium constant Kp for the reaction ; CCl4(g) C(s) + 2Cl2(g) at 700 celcius is 0.76 atm. Determine the initial pressure of carbon tetrachloride
devise a general method for determining the fractional abundances of two or more isotopes from a mass spectrum. your method must include some means of measuring the signals
how many milliliters of a stock solution of 2.00 m kno3 would you need to prepare 100.0 ml of 0.150M KNO3
Calculate the pH at equivalence point when 40.0 ml of 0.50 M aniline is titrated with 30.0 ml of 0.67 M HBr. For aniline Kb=3.8x10exp
Suppose you have a sample of sodium weighing 11.42 g. How many atoms of sodium are present in the sample.
for each of the following changes at equilibrium, indicate whether the equilibrium shifts toward products or reactants or does not shift: a)increasing the temperature. b)adding C(s). c)removing CO(g) as it forms. d)adding H2O(g). decreasing the vo..
What is the molar mass of sodium chloride. In an ionic reaction between sulfate and calcium, the ratio of calcium to sulfate ions is what
A mixture is prepared using 25.00 mL of 0.08000 M aniline, 25.00 mL of 0.06000 M sulfanilic acid and 1.00 mL of 1.230 × 10-4 M HIn and then diluting to 100.0mL
Identify each of the following substances as an element, compound, solution, or heterogeneous mixture
how many grams of magnesium chloride could be formed from the rraction of 6.82 grams of magnesium with excess
one of the most important enzymes in the world is nitrgoenase the plant protein that catalyzes nitrogen fixation. the
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