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arsen [322]
2 years ago
7

Calculate the molality of a 15.0% by mass solution of MgCl 2 in H 2O. The density of this solution is 1.127 g/mL. Group of answe

r choices
Chemistry
1 answer:
saul85 [17]2 years ago
3 0

Answer:

1.86 m

Explanation:

Step 1: Calculate the mass of solute and solvent in 100 grams of solution

We have a 15.0% by mass solution of MgCl₂ (solute) in H₂O (water). In 100 g of solution, there are 15.0 g of solute and 100.0 g - 15.0 g = 85.0 g of solvent.

Step 2: Calculate the moles corresponding to 15.0 g of MgCl₂

The molar mass of MgCl₂ is 95.21 g/mol.

15.0g \times \frac{1mol}{95.21 g} = 0.158mol

Step 3: Convert the mass of water to kilograms

We will use the relationship 1 kg = 1,000 g.

85.0g \times \frac{1kg}{1,000g} = 0.0850kg

Step 4: Calculate the molality of the solution

m = \frac{0.158mol}{0.0850kg} = 1.86m

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 <u><em>calculation</em></u>

Step 1 : find the  moles of iron (ii) hydroxide (  Fe(OH)₂

moles =  mass÷  molar mass

from periodic table the  molar mass of Fe(OH)₂  = 56 + [16 +1]2  = 90 g/mol

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