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03-07-2008, 07:58 PM
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| Chemistry help? (pt.1)? I have 50 questions in all but I'm only gonna ask for help with 20 (5 in different questions). It'll be great if anybody could help me, my grade is depending on this! Explanations would be nice also thanks! :] 1.The mol fraction of NH4Cl in a solution is 0.0311. What is it's molality? (Molar mass of water is 18.016 g/mol) 2.What is the mol fraction Na2SO4 in a solution which is 11.5% by weight Na2SO4 (molar mass Na2SO4=142.06 g/mol and H2)=18.016)? 3. What is the mol fraction NaNo3 in a solution which is 2.15 m? 4. A1.34 M NiCl2( molar mass = 129.6 g/mol) solution has a density of 1.12 g/cm^3. What is the weight % NiCl2 of the solution? 5. A 1.25 M (Cu(No3)2 [molar mass =187.56 g/mol) solution has a density of 1.19 g/cm^3. What is the weight % Cu(NO3)2 of the solution?      |
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