About measures: choose only the correct alternative(s). Choose one or more: a) 10.0 g of ascorbic acid (vitamin C, H2C6H6O6) is dissolved in enough water to prepare 125 ml of solution. The molar concentration of this component in the solution is 4.54 x 10-3 mol/L. b) 50.0 ml of an aqueous solution of potassium nitrate, KNO3, 0.134 mol/L is diluted by adding a quantity sufficient to increase its volume to 225 ml. The new concentration will be 2.98 x 10-2 mol/L. c) In the case of a solution prepared by dissociating 1 g of table salt and 1 g of sugar in 100 g of water, we consider water as a solute and salt and sugar as a solvent. d) From the empirical formula we can calculate the relative amount of elements present, that is, the percentage composition of the substance. e) The structural formula of a substance not only gives the number of each type of atom in the molecule, but also shows how they are linked together inside the molecule.
About measures: choose only the correct alternative(s). Choose one or more:
a) 10.0 g of ascorbic acid (vitamin C, H2C6H6O6) is dissolved in enough water to prepare 125 ml of solution. The molar concentration of this component in the solution is 4.54 x 10-3 mol/L.
b) 50.0 ml of an aqueous solution of potassium nitrate, KNO3, 0.134 mol/L is diluted by adding a quantity sufficient to increase its volume to 225 ml. The new concentration will be 2.98 x 10-2 mol/L.
c) In the case of a solution prepared by dissociating 1 g of table salt and 1 g of sugar in 100 g of water, we consider water as a solute and salt and sugar as a solvent.
d) From the empirical formula we can calculate the relative amount of elements present, that is, the percentage composition of the substance.
e) The structural formula of a substance not only gives the number of each type of atom in the molecule, but also shows how they are linked together inside the molecule.
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