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Home Q & A Board Biology-Related Homework Help Cell Biology
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BUGG123 BUGG123
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12 years ago
I have a few problems on my chemistry online homework regarding this.
The questions states: "Carbon tetrachloride (CCL4) is a liquid.
Assuming that CCl4 has a density of 1.595 g/mL what is the molarity of pure CCl4?"
I have no idea how to solve this problem, help?
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buggyg69buggyg69
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12 years ago
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12 years ago
Density of a substance gives the number of grams in one milliliter of a substance.  Molarity of a solution (or liquid in this case) is the number of moles in one liter of solution (or liquid).  Since 1 milliliter of carbon tetrachloride has a mass od 1.595 grams, then 1000 milliliters (or 1 liter) of CCl4 would have a mass of 1,595 grams.  We can now convert this mass to moles of CCl4 using dimensional analysis and the following equality to set up the conversion factor:

1 mol CCl4 = 153.823 g CCl4

[(1,595 g CCl4)/1][(1 mol CCl4)/(153.823 g CCl4)] = 10.36906 mol CCl4 or 10.37 mol CCl4 rounded to four significant figures.

Answer:  Since there are 10.37 moles of carbon tetrachloride in each liter of the liquid, the molarity of pure CCl4 is 10.37 M.
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