Question

24 g of magnesium was reacted with excess hydrochloric acid. Calculate how many moles of magnesium reacted.

Answer 1

Answer:

Explanation:

Mg+ 2 HCl =========> MgCl2 + H2.

Atomic weight of Mg= 24.

So 24- g of Mg will liberate 22.4 Litres of Hydrogen gas at STP.

So 0.24g of Mg will liberate =22.4x0.24/24= 0.224- Litres of Hydrogen gas at STP.( Or)

224 ml of Hydrogen gas at STP. ============================

At rtp the volume of 1- mole a gas= 24- Litres.

So volume of 0.01- mole a gas at rtp will occupy= 0.01 x 24= 0.240- litres (or) 240 - ml.