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
.
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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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Write a balanced equation for the combustion of benzoic acid,, to give and . How many milligrams of and of will be produced by the combustion of 4.635mgof benzoic acid?
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?
What measures can be taken to decrease the relative supersaturation during a precipitation?
Combustion 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.
Combustion analysis of an organic compound gave the composition , and . Find the coefficients and and their uncertainties and in the formula .
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