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Elan Coil [88]
2 years ago
12

Se realiza una mezcla de minerales de Cu y Fe: 20 kg FeS2 (pirita), 70 kg de Fe2O3 (hemetita) 15 kg de CuFe2 (calcopirita) y 90

kg de CuO (tenorita). Calcule: Porcentaje de hierro Porcentaje de cu Porcentaje de azufre y oxigeno
Chemistry
1 answer:
Artemon [7]2 years ago
8 0

Answer:

34.78% Fe

39.66% Cu

5.48% S

20.07% O

Explanation:

Para resolver esta pregunta debemos hallar la masa de cada átomo en cada mineral. Así, podremos hallar el porcentaje de cada átomo:

<em></em>

<em>Pirita (Fe: 55.845g/mol; S: 32.065g/mol; FeS2: 119.975g/mol)</em>

Masa Fe:

20kg FeS2 * (1*55.845g/mol / 119.975g/mol) = <em>9.31kg Fe</em>

Masa S:

20kg FeS2 * (2*32.065g/mol / 119.975g/mol) = <em>10.69kg S</em>

<em>Hemetita (Fe: 55.845g/mol; O: 16g/mol; Fe2O3: 159.688g/mol)</em>

Masa Fe:

70kg Fe2O3 * (2*55.845g/mol / 159.688g/mol) = <em>48.96kg Fe</em>

Masa O:

70kg Fe2O3 * (3*16g/mol / 159.688g/mol) = <em>21.04kg O</em>

<em>Calcopirita (Fe: 55.845g/mol; Cu: 63.546g/mol; CuFe2: 175.236 g/mol)</em>

Masa Fe:

15kg CuFe2 * (2*55.845g/mol / 175.236 g/mol) = <em>9.56kg Fe</em>

Masa Cu:

15kg CuFe2 * (1*63.546g/mol / 175.236 g/mol) = <em>5.44kg Cu</em>

<em />

<em>Tenorita (O: 16g/mol; Cu: 63.546g/mol; CuO: 79.545 g/mol)</em>

Masa O:

90kg CuO * (1*16g/mol / 79.545 g/mol) = <em>18.10kg O</em>

Masa Cu:

90kg CuO * (1*63.546g/mol / 79.545 g/mol) = <em>71.90kg Cu</em>

<em />

Masa Total: 20kg + 70kg + 15kg + 90kg = 195kg

Porcentaje Hierro:

9.31kg Fe + 48.96kg Fe + 9.56kg Fe / 195kg * 100 =

34.78% Fe

Porcentaje Cobre:

5.44kg Cu + 71.90kg Cu / 195kg * 100 =

39.66% Cu

Porcentaje Azufre:

10.69kg S / 195kg * 100 =

5.48% S

Porcentaje Oxígeno:

21.04kg O + 18.10kg O/ 195kg * 100 =

20.07% O

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Answer:

54 grams ammonium chloride and 40 grams sodium hydroxide

Explanation:

A buffer is a solution that contains either a weak acid and its salt or a weak base and its salt, the solution is resistant to changes in pH. This means that, a buffer is an aqueous solution of either a weak acid and its conjugate base or a weak base and its conjugate acid.

A Buffer is used to maintain a stable pH in a solution, buffers can neutralize small quantities of additional acid of base. For any buffer solution, there is always a working pH range and a set amount of acid or base that can be neutralized before the pH will change. The amount of acid or base that can be added to a buffer before changing its pH is called its buffer capacity.

A good buffer mixture is supposed to have about equal concentrations of its both components. It is a rule of thumb therefore, that a buffer solution has generally lost its usefulness when one component of the buffer pair is less than about 10% of the other component.

The implication of this is that the ammonium chloride and sodium hydroxide should be of approximately the same concentration. If the masses are dissolved as shown in the answer, then we will have 1molL-1 of each component of the buffer in accordance with the rule of thumb stated above.

4 0
3 years ago
Which of the following produces a chemical change?
Svetlanka [38]
Exposure to chemicals.
5 0
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2
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Answer:

Three product with are SO2, H2O and CuSO4

Explanation:

6 0
3 years ago
What variable represents specific heat in the equation Q = mcAT?
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Answer: A. The variable c

============================================

Explanation:

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4 0
3 years ago
a solution of KCl in water has a concentration of 0.243 M. The solution has a volume of 0.580 L. How many grams of KCl are prese
Novosadov [1.4K]

Answer:

10.5 g

Explanation:

Step 1: Given data

  • Molar concentration of the solution (C): 0.243 M
  • Volume of solution (V): 0.580 L

Step 2: Calculate the moles of solute (n)

Molarity is equal to the moles of solute divided by the liters of solution.

M = n/V

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n = 0.243 mol/L × 0.580 L = 0.141 mol

Step 3: Calculate the mass corresponding to 0.141 moles of KCl

The molar mass of KCl is 74.55 g/mol.

0.141 mol × 74.55 g/mol = 10.5 g

8 0
2 years ago
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