Mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dil. is:

(Given: Molar mass of Mg is 24 g mol)

Question

Mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dil.  is:

(Given: Molar mass of Mg is 24 g mol)

Canvas Classes · Accepted Answer

Strategy:
 Reaction: .  of Magnesium produces  of Hydrogen gas. Determine the moles of gas at STP and calculate the corresponding mass of Magnesium.

Step 1: Calculate moles of Hydrogen
At STP (, ), molar volume .

Step 2: Calculate mass of Magnesium
Ratio is , so  of  is needed.

The nearest answer choice is 236 mg.

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