General Chemistry Online: Companion Notes: Compounds: Classifying compounds: Quiz: Interpret formulas

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Compounds

Classifying compounds

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1. The deadly nerve gas tabun, (CH₃)₂NP(O)(C₂H₅O)(CN), was manufactured by the Germans in World War II but never used. A sample containing traces of tabun is found to contain 2.4 x 10¹⁹ nitrogen atoms. The maximum number of tabun molecules that the sample could contain is:

4.8 x 10¹⁹

2.4 x 10¹⁹

none of these

1.2 x 10¹⁹

0.9 x 10¹⁹

2. The total number of atoms in 10 molecules of CO₂ is:

none of these

3. Realgar, As₂S₂, is a soft red-orange mineral that was once used in colored fireworks. An explosion that releases a million atoms of arsenic could contain how many molecules of realgar?

1 x 10⁵

2 x 10⁶

5 x 10⁵

2 x 10⁵

1 x 10⁶

4. The structures of the male and female sex hormones testosterone (C₁₉H₂₈O₂) and estradiol (C₁₈H₂₄O₂) are remarkably similar considering their profoundly different effects. Three molecules of testosterone contains how many more carbon atoms than three molecules of estradiol?

none of these

5. Stearin, C₃H₅(C₁₈H₃₅O₂)₃, is a constituent of most animal fats and is used for making soap, candles, and candies. How many carbon atoms are in one molecule of stearin?

none of these

6. The number of hydrogen atoms in 8 molecules of methanol, CH₃OH, is

none of these

General Chemistry Online! Quiz: Interpret formulas