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Chapter 26: Problem 12

Using information from the periodic table, calculate: a) the average mass (in amu) of one methane molecule (to two decimal places). b) the average mass (in amu) of one carbon tetrachloride molecule (to two decimal places).

Short Answer

Expert verified
a) The average mass of one molecule of methane is 16.05 amu. \(\) b) The average mass of one molecule of carbon tetrachloride is 153.81 amu.

Step by step solution

01

Calculate the average mass of a methane molecule

According to the periodic table, the atomic mass of a carbon atom is 12.01 amu, and that of hydrogen is 1.01 amu. Therefore, the molecular mass of a methane molecule (CH4) is the sum of the atomic mass of one carbon atom and four hydrogen atoms: (1 * 12.01) + (4 * 1.01) = 16.05 amu.
02

Calculate the average mass of a carbon tetrachloride molecule

Similarly, from the periodic table, the atomic mass of a chlorine atom is 35.45 amu. Therefore, the molecular mass of a carbon tetrachloride molecule (CCl4) is the sum of the atomic mass of one carbon atom and four chlorine atoms: (1 * 12.01) + (4 * 35.45) = 153.81 amu.

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Most popular questions from this chapter

Suppose you have two samples. One contains \(1.5\) moles of methane molecules and one contains \(1.5\) moles of carbon tetrachloride molecules. a) Which sample contains a greater number of molecules? Explain your reasoning. b) Which sample weighs more? Explain your reasoning.

Use a grammatically correct sentence to describe how the mass in amu of one molecule of a compound is related to the mass in grams of one mole of that compound.

What number of elephants is a dozen elephants?

a) What number of carbon atoms are found in one dozen methane, \(\mathrm{CH}_{4}\), molecules? b) What number of carbon atoms is found in one dozen carbon tetrachloride, \(\mathrm{CCl}_{4}\), molecules?

a) What number of legs is found in one mole of chihuahuas? b) How many moles of legs are found in one mole of chihuahuas? c) Explain how you arrived at your answer to part b using grammatically correct sentences.
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