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iren2701 [21]
3 years ago
9

Calculate the percent composition by mass of each element in Al(OH)3. Use at least three significant figures.

Chemistry
1 answer:
allsm [11]3 years ago
6 0

Answer:

34.59 % Al; 61.54 % O; 3.877 % H

Explanation:

% by mass = mass of element/total mass × 100 %

Let's rewrite the formula of Al(OH)₃ as AlO₃H₃.

Set up a table for easy calculation.

<u>Atom</u>  <u>  Mass/u   </u>   <u>Subtotal </u>

1Al     1 × 26.98   = 26.98   u

3O     3 ×  16.00  =  48.00   u

3H     3 ×    1.008 = <u>  3.024 u </u>

                   Total = 78.004 u

Mass % Al = 26.98/78.004   × 100 % = 34.59   %

Mass % O = 48.00/78.004   × 100 % =  61.54   %

Mass % H =    3.024/78.004 × 100 % =   3.877 %

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Hydrogen peroxide is another way of dihydrogen dioxide

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Una solución contiene 25.10 ml de H2SO4 (densidad de 1.34 g/ml). Calcular la molaridad, moralidad, normalidad, fracción molar de
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Answer:

Molaridad: 0.80 mol/L

Molalidad: 0.80 mol/kg

Xst: 0.014

Xsv: 0.986

N: 1.6 Eq/L

Explanation:

Volumen de soluto: 25.10 mL (ácido sulfúrico)

Volumen de solvente: 426 mL (agua)

Sabemos que la densidad del acido es 1.34 g/mL, por lo que podemos calcular así la masa de ácido en solución:

1.34 g/mL = masa / volumen

1.34 g/mL . 25.10 mL = 33.6 g

Con la masa molar, calculamos moles: 33.6 g . 1 mol / 98g = 0.343 moles

Molaridad: (moles de 1 soluto en 1 L de solución)

Convertimos mL a L, asumimos que el volumen de solvente es el volumen total: 426 mL . 1L / 1000 mL = 0.426 L

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No existe moralidad en Quimica, asumo que es molalilad

La molalidad señala moles de soluto en 1 Kg de solvente. Necesitamos la masa de solvente que calculamos a traves de la densidad del agua:

1 g/ mL = masa / volumen

1 g/mL . 426 mL = 426 g de solvente

Convertimos a kg → 426 g . 1 kg / 1000 g = 0.426 kg

0.343 mol / 0.426 kg = 0.80 m

Para las fracciones molares sumamos los moles de cada compuesto

Moles de soluto + moles de solvente = Moles totales

Xst = moles de soluto / moles totales

Xsv = moles de solvente / moles totales

Los moles de solvente son: 426 g . 1mol / 18g = 23.67 moles

0.343 mol st + 23.67 mol sv = 24.013 moles

Xst = 0.343 / 24.013 = 0.014

Xsv = 23.67 / 24.013 = 0.986

La normalidad señala la cantidad de equivalentes de soluto, contenidas en 1L de solución:

Se calculan los Eq como (masa molar / N° de H⁺ u OH⁻ si es base)

Eq acido sulfurico = 98 g / 2 = 49 Eq

(Dividido 2 porque son 2 H⁺)

Eq acido sulfurico en 33.6 g = 33.6 g / 49 → 0.686 Eq

N = 0.686 Eq / 0.426 L → 1.61 N

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8 0
3 years ago
The atomic notation for a particular atom of boron is 11/5 B. The atomic number is while the mass number is_, while the mass num
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The atomic number=5

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<h3>Further explanation</h3>

In the following element notation,

\tt \large {{{A} \atop {Z}} \right X}

 X = symbol of elemental atom

A = mass number

   = number of protons + number of neutrons

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So for The atomic notation for a particular atom of Boron  :

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0.025 moles of NO₂  will produced.

                                     

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