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Chapter 2: Q16P (page 81)

(a) Does the percent by mass of each element in a compound depend on the amount of compound? Explain.

(b) Does the mass of each element in a compound depend on the amount of compound? Explain.

Short Answer

Expert verified

The mass percent of elements is fixed in a given compound. It does not change with the amount of compound while the mass of each element in a compound depends on the amount of compound.

Step by step solution

01

Mass percent of each element in a compound

The mass percent of the element does not depend on the amount of the compound as the elements combine in the fixed ratio in a given compound. So, the mass percent of elements is fixed in a given compound. Thus, the given statement is false.

02

Massof each element in a compound

Elements combine in a fixed ratio of mass to form a compound so mass percent is fixed but not the mass. As the mass of the compound changes, the mass of elements also changes accordingly. Hence, we can say that mass of each element in a compound depends on the amount of compound.

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Most popular questions from this chapter

Show, with calculations, how the following data illustrate the law of multiple proportions:Compound 1: 77.6 mass % xenon and 22.4 mass % fluorineCompound 2: 63.3 mass % xenon and 36.7 mass % fluorine

Samples of illicit “street” drugs often contain an inactive component, such as ascorbic acid (vitamin C). After obtaining a sample of cocaine, government chemists calculate the mass of vitamin C per gram of drug sample, and use it to track the drug’s distribution. For example, if different samples of cocaine obtained on the streets of New York, Los Angeles, and Paris all contain 0.6384 g of vitamin C per gram of sample, they very likely come from a common source. Do these street samples consist of a compound, element, or mixture? Explain.

Give the name, atomic symbol, and group number of the element with the following Z value, and classify it as a metal, metalloid, or nonmetal:

(a) Z = 33 (b) Z = 20 (c) Z = 35 (d) Z = 19 (e) Z = 13

The following charges on individual oil droplets were obtained during an experiment similar to Millikan's. Determine a charge for the electron( in coulombs), and explain your answer:
-1.602×1019C;-4.806×10-19C;-8.010×10-19A;-14.42×10-19C

What is the key difference between an element and a compound?
See all solutions

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