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Annette [7]
4 years ago
9

5. Which of the following methods should be used to determine whether a

Chemistry
1 answer:
Marina CMI [18]4 years ago
6 0

Answer:

Physical separation

Explanation:

  • Titration is a process in which we use a titrant, a solution of known concentration, and adding it to our analyte, a solution of unknown concentration. Using an indicator within the analyte solution lets us find the equivalence point, as indicator changes the color when all of the solute in the unknown solution reacted. We can then apply stoichiometry and find the molarity of the analyte. Hence, this is a process of determining molarity.
  • Combustion is a process in which we burn a substance in excess of oxygen, it produces new products.
  • Physical separation is a process to separate a mixture of several compounds into its individual components, usually based on different solubility, different boiling point or different density/polarity.
  • Chemical decomposition is a process in which we heat an insoluble substance to a high temperature and decompose it into separate new substances.
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What is the boiling point of 0.464 m lactose in water? (Kb of water = 0.512 oC/m). Enter your answer to 3 decimal places.
kirill [66]

Answer:

Boiling point for the solution is 100.237°C

Explanation:

We must apply colligative property of boiling point elevation

T° boiling solution - T° boiling pure solvent = Kb . m

m = molalilty (a given data)

Kb = Ebulloscopic constant (a given data)

We know that water boils at 100°C so let's replace the information in the formula.

T° boiling solution - 100°C = 0.512 °C/m . 0.464 m

T° boiliing solution = 0.512 °C/m . 0.464 m + 100°C → 100.237 °C

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The molar mass of iron(Fe) is 55.8 g/mol. what is the mass in grams of 2.25 moles of iron?
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if 1 mole is 55.8 gr., then 2.25 moles the mass should be 55.8*2.25=125.55 gr.


Answer: 125.55 gr.

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