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Chapter 3: Problem 36

Describe how the knowledge of the percent composition by mass of an unknown compound can help us identify the compound.

Short Answer

Expert verified
The knowledge of the percent composition by mass of an unknown compound can help us identify the compound by providing details about the proportion of elements in it. This leads us to the empirical formula and thus, the identity of the compound.

Step by step solution

01

Definition of Percent Composition

Percent Composition is a calculation of how much of each element constitutes a compound, expressed in terms of percentages. This information can be derived from the compound's molecular or empirical formula.
02

Role of Percent Composition in Compound Identification

Knowing the percent composition by mass of an unknown compound helps us identify the compound because it provides us with specific details about the proportion in which the elements combine to form the compound. This information can draw us closer to the empirical formula and eventually to the identity of the compound.
03

Application in Chemistry

Percent Composition is used in chemistry to determine the amount of specific elements present in chemical compounds. This knowledge is useful when experimenting, analysing substances or when trying to recreate a particular compound in the lab.

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Most popular questions from this chapter

Ammonia is a principal nitrogen fertilizer. It is prepared by the reaction between hydrogen and nitrogen. $$ 3 \mathrm{H}_{2}(g)+\mathrm{N}_{2}(g) \longrightarrow 2 \mathrm{NH}_{3}(g) $$ In a particular reaction, 6.0 moles of \(\mathrm{NH}_{3}\) were produced. How many moles of \(\mathrm{H}_{2}\) and how many moles of \(\mathrm{N}_{2}\) were reacted to produce this amount of \(\mathrm{NH}_{3} ?\)

Monosodium glutamate (MSG), a food-flavor enhancer, has been blamed for "Chinese restaurant syndrome," the symptoms of which are headaches and chest pains. MSG has the following composition by mass: 35.51 percent \(\mathrm{C}, 4.77\) percent \(\mathrm{H}, 37.85\) percent \(\mathrm{O}, 8.29\) percent \(\mathrm{N},\) and 13.60 percent \(\mathrm{Na}\). What is its molecular formula if its molar mass is about \(169 \mathrm{~g} ?\)

Write the symbols used to represent gas, liquid, solid, and the aqueous phase in chemical equations.

Carbohydrates are compounds containing carbon, hydrogen, and oxygen in which the hydrogen to oxygen ratio is 2: 1 . A certain carbohydrate contains 40.0 percent carbon by mass. Calculate the empirical and molecular formulas of the compound if the approximate molar mass is \(178 \mathrm{~g}\).

A reaction having a 90 percent yield may be considered a successful experiment. However, in the synthesis of complex molecules such as chlorophyll and many anticancer drugs, a chemist often has to carry out multiple-step synthesis. What is the overall percent yield for such a synthesis, assuming it is a 30 -step reaction with a 90 percent yield at each step?
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