Hi, can you help with how to solve this equation?
50.0 gram sample of NaCl is added to water to create a 0.50 L solution. What volume of this solution is needed to create a 1.30 L solution that is 0.100 M NaCl?
The choices provided:
a) 152 mL
b) 255 mL
c) 87.6 mL
d) 412 mL
10.1 mL
I tried various ways to solve using Molarity and converting the grams of NaCl to moles. No answer comes close. Thank you, Cass

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  1. mols NaCl = 50/molar mass = ?M which is approx 0.9 but you need a more accurate answer than that for this as well as the other calculations.
    M of the NaCl solution is about 0.9/0.5 = about 1.8 M. Then
    mL1 x M1 = mL2 x M2
    mL1 x 1.8 = 1300 x 0.1M
    You're right. Remember the 1.8 is approx. No choice is close. Key must be wrong. What's the 10.1 mL. Is that the e choice.

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    posted by DrBob222
  2. Thanks for replying. Sorry, the 10.1 is the (e) choice. I had tried various ways after I posted my question and I may have found the answer. I used the Dilution equation and found an answer of .152 L which would then convert to (a) of 152 mL. Still not sure if it is correct and will take what you provided. Thanks again. Cass

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  3. If you will post how you obtained the 152 mL I shall be happy to check it for you.

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    posted by DrBob222

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