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-A sample of pyrite, FeS2(MW=119.97), contains only inert impurities and weights 0.5080 g. After the sample has been decomposed and dissolved, a precipitate of 1.561 g of BaSO4 (MW=233.40) is obtained. If the calculated percentage of S (MW=32.06) in the sample is 42.21% what weight of ignited precipitate would have been obtained if the Fe (MW=55.85) in the solution had been precipitated as Fe (OH)3and ignited as Fe2O3(MW=159.7)?
-In 100 mL of 0.2 M NH3 solution was added 50 mL of 0.3 M NH4Cl solution. If Kb of NH3 is 1.75 x 10-5, calculate the pH of the final mixture.
-An indicator which is a weak monobasic acid is blue in a strongly acid solution and yellow in a strongly basic one. If Kind is 10 - 10, what is the pH when 40% of the indicator is in the yellow form?
Nitrogen gas reacts with hydrogen gas to produce ammonia by the following equation, N2(g)+3H2(g)-->2NH3(g). a) If you have 1.80 mol of H2, how many grams of NH3 can be produced
Assign absolute configurations to the chiral carbons n one of your Fischer projections. Indicate which of the compounds you have drawn would be optically active. Explain your reasoning.
Describe in detail which form(s) of energy get converted into which other form(s) during the various steps in the process.
Blocks mass is 50.0 g in air. while placed in water (20 Celcius, d=.99821 g/cm3), the block only weighs 5.6 grams. Explain what is density of the block
What is the balanced cell reaction for the following echem cell set-up. Pt(s) / PbO2(s) / Pb(NO3)2, HNO3 // Cr(NO3)3 / Cr(s)
Write mathematical equation that show how you will calculate the detected activity from the count rate the sample KCl
suppose you wanted to heat a mug of water 250 ml from room temperature 25 c to 100 c to make a cup of tea. how much
When a container is filled with 3.00 mol of H2 , 2.00 mol of O2 , and 1.00 mol of N2 , the pressure in the container is 465 kPa. determine the partial pressure of O2?
What kind of problems might occur when an American multi-national corporation tries to expand its business operations to China. Please illustrate your example w
Part A Given 7.80 of butanoic acid and excess ethanol , how many grams of ethyl butrate would be synthesized , assuming a complete 100% yield
What are the advantages and disadvantages of natural products as lead compound?
Calculate the volume of oxygen required to burn 5.00 L of propane gas, C3H8, to produce carbon dioxide and water, if the volumes of both the propane
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