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inlace1161
26.02.2020 •
Chemistry
A solution of H 2 SO 4 ( aq ) H2SO4(aq) with a molal concentration of 8.01 m 8.01 m has a density of 1.354 g / mL . 1.354 g/mL. What is the molar concentration of this solution?
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Ответ:
[H₂SO₄] = 6.07 M
Explanation:
Analyse the data given
8.01 m → 8.01 moles of solute in 1kg of solvent.
1.354 g/mL → Solution density
We convert the moles of solute to mass → 8.01 mol . 98g /1mol = 785.4 g
Mass of solvent = 1kg = 1000 g
Mass of solution = 1000g + 785.4 g = 1785.4 g
We apply density to determine the volume of solution
Density = Mass / volume → Volume = mass / density
1785.4 g / 1.354 g/mL = 1318.6 mL
We need this volume in L, in order to reach molarity:
1318.6 mL . 1L / 1000mL = 1.3186 L ≅ 1.32L
Molarity (mol/L) → 8.01 mol / 1.32L = 6.07M
Ответ:
6.08M
Explanation:
8.010 m means 8.010 mol / 1 kg of solvent
Molar mass of H2SO4=98g/mol
8.01mol × 98g/mol = 784.98 g of solute
784.98g + 1000 g = 1784.98g total for solute and solvent in the 8.010 m solution.
But density of acid=1.354g/ml
1784.98 g ÷ 1.354 g/mL = 1318.30 mL
1318.30/1000 = 1.3183L
8.01 moles / 1.3183 L = 6.08 M
6.08M
Ответ:
We will call D1 and D2 the volume of dextrose at 2.5% and 30% respectively
D1 + D2 = 500 (1)
D1*2,5/100 + D2*30/100 = 500*10/100 (2)
(2,5D1+30D2)/100 = 50
2,5D1 +30D2 = 50*100 = 5.000 (2)
D1 = 500 - D2 Now we clear D1 in (1)
2,5(500-D2) + 30D2 = 5.000 and we substitute in (2)
1.250 - 2,5D2 + 30D2 = 5.000
27,5D2 = 5.000 - 1.250 = 3.750
D2 = 3.750/27,5 = 136ml +4/11ml
D1 = 500ml - 136ml +4/11ml
D1 = 363ml +7/11ml
ANSWER 363ml+7/11 ml of dextrose 2,5% and 136ml+4/11 ml dextrose 30%