Stoichiometry

Question 1

Balance:

C2H6 + O2 -> CO2 + H2O

Answer 1

1. Begin with the single elements
2. Balance elements one by one
3. Come to a fraction then multiply both sides by 2.
   = 2C2H6 + 7O2 -> 4CO2 + 6H2O

Question 2

A mole

Answer 2

6.022x10 to the power of 23

Atoms