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zhuklara [117]
3 years ago
12

You can practice converting between the mass of a solution and mass of solute when the mass percent concentration of a solution

is known. The concentration of the KCN solution given in Part A corresponds to a mass percent of 0.173 %. What mass of a 0.173 % KCN solution contains 779 mg of KCN
Chemistry
1 answer:
vfiekz [6]3 years ago
6 0

Answer:

450. g of 0.173 % KCN solution contains 779 mg of KCN.

Explanation:

Mass of the solution = m

Mass of the KCN in solution = 779 mg

Mass by mass percentage of KCN solution = 0.173%

(m/m)\%=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 100

0.173\%=\frac{779 mg}{m}\times 100

m=\frac{779 mg}{0.173}\times 100= 450,289 mg

1 mg = 0.001 g

m = 450,289 mg × 0.001 g = 450.289 mg ≈ 450. g

450. g of 0.173 % KCN solution contains 779 mg of KCN.

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Answer:

c. -1020.9 kJ

Explanation:

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Heat released by 1.23268 moles

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An aluminum block has a density of 2.70 g/mL. If the mass of the block is 24.60 g, find the volume of the substance.
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Volume of a substance can be determined by dividing mass of the substance by its density.

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Enthalpy change is a measure of the energy emitted or consumed in a reaction. This can be determined using the following equation which involves standard enthalpy of reactant and product formation:

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