Chapter 26

What number of elephants is a dozen elephants?

a) What number of trunks is found in one dozen elephants? b) What number of noses is found in one dozen chihuahuas?

a) What number of legs is found in one dozen elephants? b) What number of legs is found in one dozen chihuahuas?

a) What number of trunks is found in one mole of elephants? b) How many moles of trunks are found in one mole of elephants?

a) What number of legs is found in one mole of elephants? b) How many moles of legs are found in one mole of elephants?

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.

What number of molecules is a dozen methane, \(\mathrm{CH}_{4}\), molecules?

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 hydrogen atoms is found in one dozen methane molecules? b) What number of chlorine atoms is found in one dozen carbon tetrachloride molecules? c) Explain how you arrived at your answer to part b using grammatically correct sentences.

a) What number of methane molecules is one mole of methane molecules? b) What number of carbon atoms is found in one mole of methane molecules? c) What number of hydrogen atoms is found in one mole of methane molecules? d) Explain how you arrived at your answer to part c using grammatically correct sentences.

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).

Based on your answers to CTQ 12, calculate: a) the mass (in grams) of one mole of methane molecules (to two decimal places). Show your work. b) the mass (in grams) of one mole of carbon tetrachloride molecules (to two decimal places). Show your work.

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.

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 grammatically correct sentences to describe how to calculate the number of \(\mathrm{H}\) atoms in " \(\mathrm{z}^{\prime \prime}\) moles of \(\mathrm{NH}_{3}\).