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nataly862011 [7]
3 years ago
9

1. What is the molarity of 6.4g of methanol dissolved in 50 moles of water2. If the density of the above solution at 25C is 1.03

kg/L what is the molarity methanol solution at 25°C
Chemistry
1 answer:
ICE Princess25 [194]3 years ago
3 0

Answer:

1. 0.22 mol/dm³

2. 0.23 mol/dm³

Explanation:

Molarity: This can be defined as the concentration of a substance  in mol per dm³

1.

M = n/v ...................... Equation 1

M = molarity of methanol, n = number of mole of methanol, v = volume of the solvent/water/solution.

<em>n = g/m.m</em>

<em>Where g = mass of methanol, m.m = molar mass of methanol.</em>

<em>g = 6.4 g, m.m = 32 g /mole.</em>

<em>n = 6.4/32 = 0.2 mole</em>

<em>and ,</em>

<em>v = m/d </em>

<em>Where m = mass of water, d = density of water</em>

<em>m = mass of 50 moles of water = 18×50 = 900 g.</em>

d = 1000 g/dm³.

v = 900/1000 = 0.9 dm³

Substituting the value of v and n into equation 1

M = 0.2/0.9

M = 0.22 mol/dm³

2.

M = n/v

v = volume of the solution

v = (mass of methanol + mass of water in the solution)/density of the solution

v = [(900+6.4)/1000]/1.03

v = 0.9064/1.03

v = 0.88 dm³

n = 0.2 mole

Therefore,

M = 0.2/0.88

M = 0.23 mol/dm³

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