Part 1 Carbontetrachloride, CCl 4 , was formerly used as a dry cleaning agent. I

Question

Part 1
Carbontetrachloride, CCl4, was formerly used as a dry cleaning agent. It is pretty nasty stuff, in that it is easily absorbed through the skin and can damage your liver.

What is the mass percent of Cl in CCl4?

Use the atomic masses from the front of the textbook and pay attention to significant figures.

%

Part 2
How many moles of CCl4 are present in 21.7 g of the compound?

moles

Part 3
How many chlorine atoms are present in 23.5 g of the compound?

To enter an answer in scientific notation, use the following convention.
2 x 10-3 = 2E-3

atoms

What is the mass (in grams) of one molecule of CCl4?

Calculate your answer to 4 sig. figs.

grams

Explanation / Answer

part 1)

mass of CCl4 = 153.82 g

mass of Cl = 35.5 g

mass% of Cl in CCl4 = (4 x 35.5 / 153.82 ) x 100

mass% of Cl in CCl4 = 92.3 %

part 2)

moles of CCl4 = 21.7 / 153.82

moles of CCl4 = 0.141 mol

part 3)

moles of Cl = 23.5 / 35.5 = 0.662 mol

number of Cl atoms = 0.662 x 6.023 x 10^23

= 3.99 x 10^23 atoms

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