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Topic: calculating molarity  (Read 3647 times)

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Offline kerilynn

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calculating molarity
« on: July 18, 2008, 11:23:17 AM »
what mass of HCl is contained in 645 mL of 0.266 M solution?
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Offline azmanam

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Re: calculating molarity
« Reply #1 on: July 18, 2008, 12:15:44 PM »
For all of these, you should start by finding the molar mass of each of the compounds.

Do you know the formula for molarity?

Do you know the formula for converting grams to moles?

Give one or two of these a try and post your results.
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Offline Think2Much4UserNames

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Re: calculating molarity
« Reply #2 on: July 21, 2008, 01:52:17 AM »
Quote from: kerilynn on July 18, 2008, 11:23:17 AM
what mass of HCl is contained in 645 mL of 0.266 M solution?

Hi...
First, I would convert 645mL to liters - (645mL/1000mL = 0.645L)
Second, I would convert liters to moles - (0.645L X 0.266M = 0.172mol)
Lastly, I would use moles to find the mass of HCl - (0.172mol X 36.5g/mol HCl = 6.28g HCl)

The answer should be close...I think connecting all those calculations together will lead to a better sig. fig.
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