Calculations- molar concentrations PLS HELP

  • Thread starter Aya
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  • #1
Aya
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Hi, I need help with this question

what is the molar concentration of 0.50 mol of NaCl dissolved in 0.30L of solution?

=moles of solute/leters of solution
=0.50mol/0.30L
=1.7 mol/L

Is this correct?

and

what mass of solute is present in 1.00L of 0.045 mol/L of Ca(oH)2, solution

I have no idea how to do this one
 

Answers and Replies

  • #2
PPonte
Aya said:
what is the molar concentration of 0.50 mol of NaCl dissolved in 0.30L of solution?

=moles of solute/leters of solution
=0.50mol/0.30L
=1.7 mol/L

Is this correct?

Yes, it is. :tongue:

what mass of solute is present in 1.00L of 0.045 mol/L of Ca(oH)2, solution

I have no idea how to do this one

First find how many moles of Ca(OH)2 there is.
nCa(OH)2 = CCa(OH)2 x Vsolution

Then find the mass of that number os moles:

mCa(OH)2 = nCa(OH)2 x M(Ca(OH)2)

M stands for http://en.wikipedia.org/wiki/Molar_mass" [Broken].
 
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  • #3
Aya
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^ ok, thank you
 
Last edited:

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