Question

how much oxygen will be required to burn 8G Methane completely

Answer 1

Answer is 32. This is explained below:

CH4 + 2o2=CO2 + 2H2O

Now mass of methane is 16 g and mass of oxygen is 64(4*16).

To burn 16 g methane ,64g of oxygen is required and in this way according to stoichiometry to burn 8g of methane we need = 64/18*8 = 32g

Hope it helps,

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Answer 2

16g of oxygen is required to burn 8g of methane completely..