We know that,
Molar mass of Copper (II) chloride (CuCl2) = 134.45g/mol
Molar mass of Hydrogen (H2)= 2.01g/mol
Number of moles = mass/Molar mass
and
Mass = (number of moles)(molar mass)
Given Value,
Mass of Copper (II) chloride = 39g
Step(1) Calculation for number of moles of CuCl2.
Number of moles of CuCl2 = mass of CuCl2 /molar mass of CuCl2
Number of moles of CuCl2 = 39g/(134.45g/mol)
Number of moles of CuCl2 = 0.29mol.
step (2) Calculation number of moles of H2
balance chemical reaction is given as follows
Cu(s) + 2HCl(l) ----------> CuCl2 (aq) + H2 (g)
From the stoichiometry of balance chemical reaction.
When one mole CuCl2 is formed in this chemical reaction, one mole of H2 is formed along with CuCl2.
hence,
When 0.29 mole of CuCl2 is formed in this chemical reaction, 0.29 mole of H2 will be formed with CuCl2.
Number of moles of H2 = 0.29mol
step(3) Calculation for mass of H2 gass
mass of H2 = (number of moles of H2 )(molar mass of H2 )
Mass of H2 = (0.29mol)(2.01g/mol)
Mass of H2 = 0.583g
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