Question

Equal masses of the metals Na, Mg, Ca and Ag are added to separate samples of excess HCl (aq). Which metal produces the greatest total volume of H2(g)?

A. Na

B. Mg

C. Ca

D. Ag

Can you explain why it is Mg?

Answer 1

Answer:

Mg.

Explanation:

Let mg be reacted with HCL, we will found the reaction in the following ways.

HCl + Mg = MgCl + H2.

Hence, when you will do it practically you will get as same.

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Answer 2

The correct answer to the following question is (b). Mg produces the greatest total volume of H₂.

• The following reaction occurs when metal reacts with excess HCl is -

Na + HCl →NaCl + 1/2H₂

Mg + 2HCl → MgCl₂ + H₂

Ca + HCl → CaCl₂ + H₂

Ag + HCl → AgCl + 1/2H₂

• Sodium and silver produce less amount of hydrogen in comparison to magnesium and calcium. As hydrogen chloride is in excess, so the amount of HCl will not be considered.

• Magnesium and calcium produce an equal amount of hydrogen.
• Now, let consider x mass of magnesium and calcium is taken. The number of moles in magnesium is x/24, and the number of moles in calcium is x/40.
• As the number of moles of magnesium is greater than that of calcium. So, magnesium yields the greatest total volume of Hydrogen.