Magnesium reacts with produce gen gas. An experiment was set up to determine the

Question

Magnesium reacts with produce gen gas. An experiment was set up to determine the in production of the hydrogen gas by measuring its change volume over the first 60 seconds of the reaction. Magnesium The volume ribbon was cut into squares of 0.5 cm^2 and 1.0 cm^2. The volume of acid solution and the total mass of magnesium were held constant in each trial. Which set of conditions would produce the highest rate of production of hydrogen gas? magnesium (A) 1 M HCl, 0.5 cm^2 pieces of (B) 1 M HCI, 0-cm^3 pieces of magnesium (C) 3 M HCl, 1.0-cm^2 pieces of magnesium (D) 3 M HCl, 0.5-cm^2 pieces of magnesium

Explanation / Answer

Mg + 2HCl ---> MgCl2 + H2

Area of Mg pieces = 0.5 cm2 (these are small pieces compare to 1.0 cm2 Mg pieces)

Maximum the surface area, faster the reaction or maximum rate

Now look at HCl, higher the concentration maximum will be the rate of reaction so

3M HCl is correct

So answer is D) 3 M HCl, 0.5 cm2 pieces of Mg

higher the concentration of HCl and Maximum surface area of Mg

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