Question

Given the balanced reaction CH4 + 2O2 -> CO2 + 2H2O2 How many moles of oxygen are needed to completely react with 3.4 moles of CH4? 
CHEMISTRY! sorry i clicked math

Answer 1

6.8 is your answer, 1 mole of CH4 reacts with 2 moles of O2

Answer 2

Answer: 6.8 moles of oxygen are needed to completely react with 3.4 moles of $CH_4$

Explanation:

$CH_4+2O_2\rightarrow CO_2+2H_2O$

According to reaction, 1 mole of $CH_4$ is reacting with 2 moles of $O_2$ then, 3.4 moles of CH_4 will react with :

$=\frac{2}{1}\times 3.4 \text{moles of }O_2$ = 6.8 moles of $O_2$

Hence, 6.8 moles of oxygen are needed to completely react with 3.4 moles of $CH_4$.