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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The chemical energy in the reactions is almost equal to the chemical energy in the products
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Fe (s) + O2 (g) --> Fe2O3 (s)
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