Solution:
The balanced chemical equation:
Mg(s) + 2HCl(aq) = MgCl2(aq) + H2(g)
According to the chemical equation: n(Mg) = n(H2)
Moles of Mg = n(Mg) = Mass of Mg / Molar mass of Mg
The molar mass of Mg is 24.305 g/mol
n(Mg) = (60.0 g / 24.305 g/mol) = 2.4686 mol
n(Mg) = n(H2) = 2.4686 mol
At STP, the volume of 1 mole of a gas contains 6.022×1023 atoms or molecules of that gas.
So,
Number of molecules of H2 = (2.4686 mol × 6.022×1023) = 1.4866×1024 = 1.49×1024
Answer: 1.49×1024 molecules of H2 are produced.
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