Answer :

Atomic mass of carbon = 12

Atomic mass of oxygen = 16


Atomic mass of helium = 4


Mass of helium = 1g


For carbon:



By putting the values, we get:



By applying criss cross method:



We get:


Mass of carbon × 4 = 12 × 1g



Mass of carbon = 3g


Thus, 3 grams of carbon is required.


For oxygen:



By putting the values, we get:



By applying criss cross method:



We get:


Mass of oxygen × 4 = 16 × 1g



Mass of oxygen = 4g


Thus, 4 grams of oxygen is required.


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