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fatherbamboo
03.05.2021 •
Chemistry
1. NaOH mass of a solution of 200g in which its percentage is 25%. What mass of sulfuric acid solution is needed to completely neutralize the alkali. What mass of salt will be formed?
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Ответ:
30 g
Explanation:
Paso 1: Escribir la reacción balanceada
Mg + 4 HNO₃ ⟶ Mg(NO₃)₂ + 2 H₂O + N₂ + 2 O₂
Paso 2: Convertir 5 g de Mg a moles
La masa molar de Mg es 24,31 g/mol.
5 g × 1 mol/24,31 g = 0,2 mol
Paso 3: Calcular los moles de Mg(NO₃)₂ generados a partir de 0,2 moles de Mg
La relación molar de Mg a Mg(NO₃)₂ es 1:1. Los moles de Mg(NO₃)₂ generados son 1/1 × 0,2 mol = 0,2 mol.
Paso 4: Calcular la masa correspondiente a 0,2 moles de Mg(NO₃)₂
La masa molar de Mg(NO₃)₂ es 148,3 g/mol
0,2 mol × 148,3 g/mol = 30 g