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VikaD [51]
3 years ago
5

What is the number of kilograms of solvent in a 0.70 molal solution containing 5.0 grams of solute?

Chemistry
1 answer:
Leya [2.2K]3 years ago
3 0
Molar mass of solute is 30 g/mol 
molality is defined as the number of moles of solute in 1 kg of solvent 
number of moles of solute - 5.0 g / 30 g/mol = 0.17 mol
molality of solution is 0.70 mol/kg
the mass of solvent when there are 0.7 mol of solute - 1 kg
then the mass of solvent when there's 0.17 mol of solute - 0.17 mol / 0.7 mol/kg
= 0.242 kg
therefore mass of solvent is 0.242 kg
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How many moles of electrons must be transferred to plate out 110 g of manganese (MW ~ 55g/mol) from a solution of permanganate (
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Answer:

14 mol e⁻

Explanation:

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8 H⁺(aq) + 7 e⁻ + MnO₄⁻(aq) ⇒ Mn(s) + 4 H₂O(l)

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Step 3: Calculate the number of moles of electrons needed to produce 2 moles of Mn

According to the half-reaction, 7 moles of electrons are required to produce 1 mole of Mn.

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4. Find the pH at each of the following points in the titration of 25 mL of 0.3 M HF with 0.3 M NaOH. The Ka value is 6.6x10-4 a
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Writing the information from the ICE Table in Equation form yields

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