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Chapter 3: Q20P (page 131)

Calculate each of the following:

  1. Mass fraction of C in cesium acetate
  2. Mass fraction of O in uranyl sulfate trihydrateUO22+

Short Answer

Expert verified
  1. Mass fraction of C is 0.125
  2. Mass fraction of O is 0.343

Step by step solution

01

Definition of Mass 

A property that reflects the quantity of matter within a sample is defined as mass

02

Calculations of mass fraction of C in cesium acetate

The molar mass of cesium acetate is 191.96gmol

Mass fraction of C=2molC(12.01gCmolC)191.96gCH3CO2Cs

Mass fraction of C is 0.125.

03

Determination of mass fraction of O in uranyl sulfate trihydrate

The molar mass of uranyl sulfate trihydrate is 420.16gmol

Mass fraction of O O=9molO(16.00gOmolO)420.16gUO2SO4.3H2O

Mass fraction of O is 0.343.

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Most popular questions from this chapter

The effectiveness of a nitrogen fertilizer is determined mainly by its mass % N. Rank the following fertilizer, most effective first: potassium nitrate; ammonium nitrate; ammonium sulfate; urea,CO(NH2).

An oxide of nitrogen contains 30.45 mass %.

(a) What is the empirical formula of the oxide?

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(a) What is the empirical formula of the chloride?

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In 1961, scientists agreed that the atomic mass unit (amu) would be defined as 1/12 the mass of an atom of 12C. Before then, it was defined as 1/16 the average mass of an atom of naturally occurring oxygen (a mixture of 16O, 17O, and 18O). The current atomic mass of oxygen is 15.9994 amu. (a) Did Avogadro鈥檚 number change after the definition of an amu changed and, if so, in what direction? (b) Did the definition of the mole change? (c) Did the mass of a mole of a substance change? (d) Before 1961, was Avogadro鈥檚 number 6.02脳1023 (when considered to three significant figures), as it is today?

Aspirin (acetylsalicylic acid, C9H8O4) is made by reacting salicylic acid (C7H6O3) with acetic anhydride [(CH3CO)2O]:

C7H6O3(S)+(CH3CO)2O(I)鈫�C9H8O4(S)+CH3COOH(I)

In one reaction, 3.077 g of salicylic acid and 5.50 mL of acetic anhydride react to form 3.281 g of aspirin. (a) Which is the limiting reactant (d of acetic anhydride = 1.080 g/mL)? (b) What is the percent yield of this reaction? (c) What is the percent atom economy of this reaction?
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