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  • 26-05-2021
  • Chemistry
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Determine the number of grams of solute needed to make each of the following molal solutions.

Determine the number of grams of solute needed to make each of the following molal solutions class=

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jufsanabriasa
jufsanabriasa jufsanabriasa
  • 31-05-2021

Answer:

a. 497g H2SO4.

b. 124g HNO3

Explanation:

Molality, m, is an unit of concentration defined as the moles of solute per kg of solvent.

a. The moles of solute, H2SO4 are:

1.16kg * (4.37mol / kg) = 5.07 moles H2SO4

Mass -Molar mass H2SO4: 98g/mol-

5.07 moles H2SO4 * (98g / mol) = 497g H2SO4

b. The moles of solute, HNO3 are:

1.97kg * (1.00mol / kg) = 1.97 moles HNO3

Mass -Molar mass HNO3: 63.01g/mol-

1.97 moles HNO3 * (63.01g / mol) = 124g HNO3

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