Answer:
For the complete combustion of 3.0 moles CH4 we need 6.0 moles O2
Explanation:
Step 1: Data given
Number of moles of CH4 = 3.0 moles
Step 2: The balanced equation
CH4(g) + 2 O2 (g) → CO2(g) + 2H2O(g)
Step 3: Calculate moles of O2
For 1 mol CH4 we need 2 moles of O2 to produce 1 mol of CO2 and 2 moles of H2O
For 3.0 moles CH4 we need 2* 3.0 = 6.0 moles of O2
To produce 3.0 moles of CO2 and 6.0 moles H2O
For the complete combustion of 3.0 moles CH4 we need 6.0 moles O2
