To determine the number of atoms in one mole of MgCl2 (magnesium chloride), you can use Avogadro's number, which is approximately 6.022 x 10^23 atoms/molecules per mole.

First, you need to calculate the molar mass of MgCl2.

Magnesium (Mg) has an atomic mass of approximately 24.31 g/mol.

Chlorine (Cl) has an atomic mass of approximately 35.45 g/mol (rounded to two decimal places).

Now, add the atomic masses of one magnesium atom and two chlorine atoms to find the molar mass of MgCl2:

MgCl2 molar mass = (1 x Mg atomic mass) + (2 x Cl atomic mass)

MgCl2 molar mass = (1 x 24.31 g/mol) + (2 x 35.45 g/mol)

MgCl2 molar mass = 24.31 g/mol + 70.90 g/mol

MgCl2 molar mass = 95.21 g/mol

So, the molar mass of MgCl2 is approximately 95.21 g/mol.

Now, using Avogadro's number, you can calculate the number of atoms in one mole of MgCl2:

Number of atoms in 1 mole of MgCl2 = 6.022 x 10^23 atoms/molecules per mole

Now, divide this by the molar mass of MgCl2 (95.21 g/mol):

Number of atoms in 1 mole of MgCl2 = (6.022 x 10^23 atoms/mol) / (95.21 g/mol)

Number of atoms in 1 mole of MgCl2 ≈ 6.32 x 10^21 atoms

So, there are approximately 6.32 x 10^21 atoms in one mole of MgCl2.

Acid +Alkali = Salt + water.

Symbolically

H^+(aq) + OH^-(aq) = H2O(l)

A prime example is

HCl(aq) + NaOH(aq) = NaCl(aq) + H2O(l)

Other neutralisation reactions are

Acid + Base = salt + water

Acid + Carbonate = salt + water + carbon dioxide.

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