Chapter 27: Q33P (page 769)
Write a balanced equation for combustion of in a C,H,N,Selemental analyzer.
Short Answer
The balanced equation for combustion of is
.
Chapter 27: Q33P (page 769)
Write a balanced equation for combustion of in a C,H,N,Selemental analyzer.
The balanced equation for combustion of is
.
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Get started for freeCombustion analysis of a compound known to contain justC,H,N, and Odemonstrated that it is 46.21wt%C,9.02wt% H, 13.74wt N and, by difference, 100 - 46.21 - 9.02 -13.74 = 31.03% O. This means that of unknown would contain46.21gof C,9.02g ofH, and so on. Find the atomic ratio C : H : N : Oand express it as the lowest reasonable integer ratio.
A solid mixture weighing 0.5485 gcontained only ferrous ammonium sulfate hexahydrate and ferrous chloride hexahydrate. The sample was dissolved in , oxidized to with , and precipitated with cupferron. The ferric cupferron complex was ignited to produce 0.1678 gof ferric oxide, (FM 159.69). Calculate the weight percent of Clin the original sample.
Man in the vat problem.15 Long ago, a workman at a dye factory fell into a vat containing hot, concentrated sulfuric and nitric acids. He dissolved completely! Because nobody witnessed the accident, it was necessary to prove that he fell in so that the man’s wife could collect his insurance money. The man weighed 70 kg, and a human body contains |6.3 parts per thousand (mg/g) phosphorus. The acid in the vat was analyzed for phosphorus to see whether it contained a dissolved human.
(a) The vat containedof liquid, and a 100.0-mL sample was analyzed. If the man did fall into the vat, what is the expected quantity of phosphorus in 100.0 mL?
(b) The 100.0-mL sample was treated with a molybdate reagent that precipitated ammonium phosphomolybdate,This substance was dried atto remove waters of hydration and heated tountil it reached the constant composition, which weighed 0.371 8 g. When a fresh mixture of the same acids (not from the vat) was treated in the same manner, 0.033 1 g ofwas produced. This blank determination gives the amount of phosphorus in the starting reagents. Thethat could have come from the dissolved man is therefore.How much phosphorus was present in the 100.0-mL sample? Is this quantity consistent with a dissolved man?
Why would a reprecipitation be employed in a gravimetric analysis?
A 0.050 02-g sample of impure piperazine contained 71.29 wt% piperazine (FM 86.136). How many grams of product (FM 206.240) will be formed when this sample is analyzed by Reaction 27-6?
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