How many moles of KF are contained in 244 mL of 0.135 m KF solution? The density of the solution is 1.22 g/mL.?

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  • How many moles of KF are contained in 244 mL of 0.135 m KF solution? The density of the solution is 1.22 g/mL.?


Answer #1 | 23/02 2016 06:52
244 mL * 1.22 g/mL = 297.7 g Let X be the moles of KF. The mass of KF = X * 58.10 g/mole Mass of water = 297.7 g - X * 58.10 g/mole kg of water = ( 297.7 g - X * 58.10 g/mole) / 1000 g/kg 0.135 m = X / ( 297.7 g - X * 58.10 g/mole) / 1000 g/kg Solve for X. I get 0.0399 moles KF
Positive: 67.889908256881 %
Answer #2 | 22/02 2016 22:52
244 mL * 1.22 g/mL = 297.7 g Let X be the moles of KF. The mass of KF = X * 58.10 g/mole Mass of water = 297.7 g - X * 58.10 g/mole kg of water = ( 297.7 g - X * 58.10 g/mole) / 1000 g/kg 0.135 m = X / ( 297.7 g - X * 58.10 g/mole) / 1000 g/kg Solve for X. I get 0.0399 moles KF
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