Magnesium reacts with hydrochloric acid as shown by the equation: Mg(s) + 2HCl(aq) MgCl2(aq) + H2(g).

a)What volume of hydrochloric acid of concentration 2 moles/dm3 reacts exactly with 0.1 mole of magnesium?
b)What mass of hydrogen is produced when 0.1 mole of magnesium reacts with excess acid?
c)What volume of hydrogen, at RTP, would be formed if 0.24 g of magnesium reacted with excess acid?

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

c. is the answer

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