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Manganese is a transition element essential for the growth of bones. What is the mass in grams of 3.22 x 1020Mnatoms, the number found in 1 kg of bone? Conversions between moles and mass23

Question

Manganese is a transition element essential for the growth of bones. What is the mass in grams of 3.22 x 1020Mnatoms, the number found in 1 kg of bone? Conversions between moles and mass23

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Solution

Para resolver esta pregunta, debemos seguir varios pasos:

  1. Determinar la masa molar del manganeso (Mn): La masa molar del manganeso (Mn) es aproximadamente 54.94 g/mol.

  2. Calcular el número de moles de átomos de Mn: Utilizamos el número de Avogadro (6.022 x 10^23 átomos/mol) para convertir el número de átomos a moles. Nuˊmero de moles=Nuˊmero de aˊtomosNuˊmero de Avogadro=3.22×1020 aˊtomos6.022×1023 aˊtomos/mol \text{Número de moles} = \frac{\text{Número de átomos}}{\text{Número de Avogadro}} = \frac{3.22 \times 10^{20} \text{ átomos}}{6.022 \times 10^{23} \text{ átomos/mol}} Nuˊmero de moles5.35×104 moles \text{Número de moles} \approx 5.35 \times 10^{-4} \text{ moles}

  3. Calcular la masa en gramos: Utilizamos la masa molar del manganeso para convertir los moles a gramos. Masa=Nuˊmero de moles×Masa molar=5.35×104 moles×54.94 g/mol \text{Masa} = \text{Número de moles} \times \text{Masa molar} = 5.35 \times 10^{-4} \text{ moles} \times 54.94 \text{ g/mol} Masa0.0294 gramos \text{Masa} \approx 0.0294 \text{ gramos}

Por lo tanto, la masa de 3.22 x 10^20 átomos de Mn es aproximadamente 0.0294 gramos.

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