A teacher has given a lab student a white chemical sample and asks her to confirm that it contains 7.03 × 1023 formula units of sodium hydroxide (NaOH). Using the balance in the laboratory, what mass of NaOH would the student have to find to verify that her teacher was correct? Round your answer to 3 significant figures.
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Ответ:
What is the mole fraction of a solution that contains 200 g of magnesium hydroxide in 225 g of water
0.215
Explanation:
Given parameters:
Mass of magnesium hydroxide = 200g
Mass of water = 225g
Unknown:
Mole fraction of solution = ?
Solution:
The mole fraction is a measurement of concentration that expresses the number of moles of solute to that of solution.
Mole fraction =
A solution is made up of solute and solvent
Number of moles =
Molar mass of Mg(OH)₂ = 24.3 + 2(16 + 1) = 58.3g/mol
Molar mass of H₂O = 2(1) + 16 = 18g/mol
Number of moles of Mg(OH)₂ =
= 3.43moles solute
Number of moles of H₂O =
= 12.5moles solvent
Mole fraction =
= 0.215