Since mole ratio of magnesium to hydrochloric acid is 1:2, the answer is 1 mole of HCL.
The moles of hydrochloric acid are needed to react with O.50 mole of magnesium is 1 mole
The amount of substance which contains same number of atoms, molecules or ions as the number of atoms present in 12 g of carbon (C-12) is called a mole.
1 mol = 6.023 * 10²³ atoms
In the question
An equation Mg +2HCl --> MgCl₂+H₂ is given
It is asked that moles of hydrochloric acid needed to react with O.50 mole of magnesium = ?
It can be seen that the equation given is balanced as the number of atoms of the elements in the reactants is equal to the atoms in the products.
The mole ratio of Mg to HCl is 1 : 2
The mole of Magnesium is 0.5
Therefore the mole of HCl required to react will be 1 mol
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