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What are the molality and mole fraction of solute in a 25.5 percent by mass aqueous solution of formic acid (HCOOH)?
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The molality is 5,54.
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∙ 7y ago
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What are the molality and mole fraction of solute in a 30.1 percent by mass aqueous solution of formic acid (HCOOH)?
30.1 percent by mass = 30.1 g HCOOH + 69.9 g H2Omoles HCOOH = 30.1 g x 1 mol/46 g = 0.654 molesmoles H2O = 69.9 g x 1 mol/18 g = 3.88 molesTotal moles = 4.53mole fraction HCOOH = 0.654/4.53 = 0.144mole fraction H2O = 3.88/4.53 = 0.856molality = moles solute/kg solvent = 0.654/0.0699 = 9.36 m
What is Percent Concentration?
Percent concentration could mean many things...MOLARITY is defined as the moles of solute per unit volume of solution so 5 moles of NaCl in one liter of solution would be 5M (molar) NaCl solution.(Note: Solution is the solvent and solute combined, usually the solid is added and then the solution is filled to a certain line once the solid has dissolved.)MOLALITY is defined as the moles of solute per kilogram of solvent (NOT solution). So 5 moles of NaCl in one kilogram of water makes 5 mol/kg NaCl. (sometimes the symbol m is used for molality but is often confused with the unit of meters).For other types of "percent concentration" of solutions check:http://en.wikipedia.org/wiki/ConcentrationA cursory glance seemed to confirm the accuracy of the information.
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The cell of Gram+ bacteria will break down against lysozyme and the cell will be injured but when it placed in sucrose the nutrient will be absorbed by the surface
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How do you find the mass percent mole fraction molality and molarity of a solution?
Mass percent = grams of solute/total grams of solution Mole fraction = mols component/total mols mix. Molarity = mols solute/L solution Molality = mols solute/kg solvent Hope this helps :)
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What are the molality and mole fraction of solute in a 30.1 percent by mass aqueous solution of formic acid (HCOOH)?
30.1 percent by mass = 30.1 g HCOOH + 69.9 g H2Omoles HCOOH = 30.1 g x 1 mol/46 g = 0.654 molesmoles H2O = 69.9 g x 1 mol/18 g = 3.88 molesTotal moles = 4.53mole fraction HCOOH = 0.654/4.53 = 0.144mole fraction H2O = 3.88/4.53 = 0.856molality = moles solute/kg solvent = 0.654/0.0699 = 9.36 m
What is the meaning of 50 percent NaOH aqueous solution?
100 g of solution containing 50 g of NaOH.
40 percent formaldehyde is called?
40% aqueous solution of formaldehyde is known as Formalin.
What amount of solid Naoh must be added to 750g of an aqueous solution to make 2.5 percent naoh solution by mass?
19
What amount of solid naoh must be added to 750 g of an aqueous solution to make 2.5 percent NAOH solution by mass?
75gm
