Question

Balance the following chemical equation.

MnO₂ + HCl → MnCl₂ + Cl₂ + H₂O

2) Using the balanced chemical equation from above, consider if 0.86 mole of MnO₂ and reacts in excess HCl, how many molecules of H₂O will be produced?

3) If you were able to input 3.42 x 10²⁵ molecules of HCl into the reaction above (with excess MnO₂), calculate the number of moles of Cl₂ produced in the reaction.

4) How many moles of iron atoms are in one mole of Fe₂O₃? How many iron atoms are in one mole of Fe₂O₃?

Answer 1

1) Balanced chemical equation

MnO₂ + 4HCl ---------------------> MnCl₂ + Cl₂ + 2H₂O

2) 1 mole of MnO₂ produces 2 mole of water as per the balacned equation

0.86 moles MnO₂ produces how many moles of water = ?

moles of water produced by 0.86 moles of MnO₂ = 0.86 x 2

= 1.72 moles of water.

3) number of molecules of HCl = 3.42 x 10²⁵

Number of moles in 3.42 x 10²⁵ molecules of HCl = 3.42 x 10²⁵/avagadro number

= 3.42 x 10²⁵/ 6.02x 10²³

= 56.81 moles.

4 moles of HCl produces 1 mole of chlorine

56.81 moles of HCl produces= 56.81 x1/4

= 14.202 moles of chlorine gas is produced.

4) 1 mole of Fe₂O₃ contains 2 moles of iron atoms.

Number of iron atoms in 1 mole of Fe₂O₃ = 2 x avagdro number

= 2 x 6.02x 10²³

= 12.04 x 10²³ iron atoms