minnie123
Calculate the molarity of the solution.
29 g of NaCl (g.f.w. = 58.5 g/mol) in 0.030 liters.
0.015 M
17 M
67 M



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afa92
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First you want to find the moles of 29g of NaCl. Then you can plug it into the equation for molarity which is moles of solute/liter of solution.

minnie123
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how do you do that???

afa92
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Find the moles of NaCl?

minnie123
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How do you do that?!?

afa92
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29 g of Nacl * molar mass of NaCl= answer

aussy123
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I think she needs you to set it up in a equation

afa92
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I just did.

afa92
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Then you take that answer and put it over the liters of solution.

minnie123
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this is my question.... how would you find the molar mass of NaCl?

afa92
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The molar mass is the sum of the atomic mass' of the Na+Cl

afa92
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which is X grams/moles

aussy123
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moles = given wt/mol. Wt
Mol.wt of nacl=23+35.5=58.5 gm
Moles = 29/58.5 = 0.495 = 0.5 moles (approx)

minnie123
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ok... i got the molar mass as 58.442 so will i do 29 * 58.442

minnie123
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@aussy123 you've got something a little wrong there hun

aussy123
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Oh sorry I missed 0.015M