2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

how many moles of ethane (C2H6) are required to produce 13.5 moles of water from the above reaction?

x = 4.5

4.5 moles of C2H6 is required to produce 13.5 moles of H2O

Explanation:

Given equation is:

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

if it requires 2 moles of C2H6 to produce 6 moles of H2O

then x moles of C2H6 is required to produce 13.5 moles of H2O

Using unitary method for solving, we get

x = 13.5 x 2 / 6

x = 13.5 / 3

x = 4.5

Therefore, 4.5 moles of C2H6 is required to produce 13.5 moles of H2O