An orange chemist needs to prepare some bromine in carbon tetrachloride for bromine test of unsaturation. He decided that the reaction of potassium bromide with potassium permanganate and sulfuric acid is the simplest approach. He reacts 250 grams of potassium bromide with 200 grams of potassium permanganate, and 450 grams of sulfuric acid. How many grams of bromine were produced with 92.5% yield? How many grams of potassium sulfate and how many water molecules were formed?

For the reaction of sodium sulfide with iron(III) chloride below (as an unbalanced reaction - that's how I will almost always give you reactions.  ALWAYS check to see if a reaction is balanced before you use it.  You balanced it in the last question; make sure you have that right before you start calculating!), you have 319.5 kg of sodium sulfide and 502.3 kg of iron(III) chloride available. What mass (in kilograms) of sodium sulfide do you NEED if you're going to reduce  all of the iron(III) chloride you have?   Na2S(s)  +   FeCl3(s)    →   Fe2S3(s)   +  NaCl(s)

In a double replacement reaction, 1.214 g of tin(ii) fluoride react with sodium phosphate to form a precipitate. If the tin (ii) phosphate precipitate weighs 1.078 g, what is the percent yield?

ABS plastic is a polymer consisting of three monomer units: acrylonitrile (C₃H₃N), butadiene (C₄H₆), and styrene (C₈H₈). A sample of ABS plastic contains 13.7% N by mass. It took 1.56 g of Br₂ to react completely with a 2.00 g sample of ABS plastic. Bromine reacts 1:1 (by moles) with the butadiene units in the polymer and nothing else, so bromination is a method for determining the quantity of butadiene in the polymer. What is the percent by mass of styrene in the polymer?