Concentration question for chemistry anyone
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Concentration question for chemistry anyone

[From: ] [author: ] [Date: 12-06-02] [Hit: ]
can someone kindly do these question so I can check.. its for an exam.1)a 600ml solution contains 8.6%w/v NaCl in water. Find the molarity.......
so I have these answers to questions I did... I don't know if they're right or not... can someone kindly do these question so I can check.. its for an exam.

1) a 600ml solution contains 8.6%w/v NaCl in water. Find the molarity.
2)you have 0.52mol NaCl in 245ml of water. Find %w/w
3) you have 0.8 mol hydrogen peroxide (H2O2) in 725ml water. Find the concentration in %w/w
4) find the concentration (in %w/w) of a 6 mol Nacl in 650mL of water

thanks in advance

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1) 8.6% (w/v) = 8.6g /100 mL = 86 g/L = 86/58.44 M = 1.471 M

2) 0.52 mol = 0.52*58.44 g = 30.39 g/245 mL water = 30.39 g/(245+30.39)g = 11.03 % (w/w)

3) 0.8 mol = 0.8*34 g = 27.2 g/(725 + 27.2) g = 3.616 % (w/w)

4) 6 mol = 6*58.44 g = 350.64 g /( 650 + 350.64)g = 35.04 % (w/w)


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