Question

5. 93 grams of copper reacts with 44 grams of hydrochloric acid to produce 39 grams of copper (II) chloride and hydrogen gas.

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Answer #1

We know that,

Molar mass of Copper (II) chloride (CuCl​​​2) = 134.45g/mol

Molar mass of Hydrogen (H​​​​​​2)= 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 CuCl​​​2.

Number of moles of CuCl​​​2 = mass of CuCl​​​2 /molar mass of CuCl​​​2

Number of moles of CuCl​​​2 = 39g/(134.45g/mol)

Number of moles of CuCl​​​2 = 0.29mol.

step (2) Calculation number of moles of H​​​​​​2

balance chemical reaction is given as follows

Cu(s) + 2HCl(l) ----------> CuCl​​​2 (aq) + H​​​​​​2 ​​​​​​(g)

From the stoichiometry of balance chemical reaction.

When one mole CuCl​​​2 is formed in this chemical reaction, one mole of H​​​​​​2 is formed along with CuCl​​​2.

hence,

When 0.29 mole of CuCl​​​2 is formed in this chemical reaction, 0.29 mole of H​​​​​​2 will be formed with CuCl​​​2.

Number of moles of H​​​​​​2 = 0.29mol

step(3) Calculation for mass of H​​​​​​2 gass

mass of H​​​​​​2 = (number of moles of H​​​​​​2 )(molar mass of H​​​​​​2 )

Mass of H​​​​​​2 = (0.29mol)(2.01g/mol)

Mass of H​​​​​​2 = 0.583g

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