Calculate the grams of magnesium needed to completely react with 100.0 mL of 0.557 M HClO₄ solution, given the following reaction:
Mg (s) + 2 HClO₄ (aq) $\rightarrow$ Mg(ClO₄) ₂ (aq) + H₂ (g)

Question

Calculate the grams of magnesium needed to completely react with 100.0 mL of 0.557 M HClO₄ solution, given the following reaction: Mg (s) + 2 HClO₄ (aq) $\rightarrow$Mg(ClO₄)₂ (aq) + H₂ (g)

Quizplus · Accepted Answer

First, calculate the moles of HClO using its concentration and volume (0.557 mol/L * 0.100 L = 0.0557 mol). Since the reaction requires 2 moles of HClO for every mole of Mg, the moles of Mg needed are half that of HClO (0.0557 mol / 2 = 0.02785 mol). Using the molar mass of Mg (24.305 g/mol), the mass of Mg needed is 0.02785 mol * 24.305 g/mol = 0.677 g.

Calculate the Grams of Magnesium Needed to Completely React with 100.0