Calculate the moles of solute needed to prepare each of the following solutions: a) 450 mL of 0.20 M KBr solution. b) 2.0 L of 1.5 M NaOH solutionGroup of answer choices0.090 mol and 3 mol6 mol , and 1.8 molenone of the above1.8 mol, and 6 mol3 mol, and 0.09 mole
Question
Calculate the moles of solute needed to prepare each of the following solutions: a) 450 mL of 0.20 M KBr solution. b) 2.0 L of 1.5 M NaOH solutionGroup of answer choices0.090 mol and 3 mol6 mol , and 1.8 molenone of the above1.8 mol, and 6 mol3 mol, and 0.09 mole
Solution
Para calcular los moles de soluto necesarios para preparar las soluciones dadas, utilizamos la fórmula de la molaridad (M):
a) Para 450 mL de una solución de 0.20 M de KBr:
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Convertimos 450 mL a litros:
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Usamos la fórmula de la molaridad para encontrar los moles de KBr:
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Despejamos los moles de KBr:
b) Para 2.0 L de una solución de 1.5 M de NaOH:
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Usamos la fórmula de la molaridad para encontrar los moles de NaOH:
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Despejamos los moles de NaOH:
Por lo tanto, las respuestas son:
a) 0.090 mol de KBr
b) 3.0 mol de NaOH
La opción correcta es: 0.090 mol y 3 mol
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