Question

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Answer 1

Oxygen (O2)

Hope it will help you

Answer 2

. I mole of c = 12 g = .6.022 X 10²³ atoms
now 2 atoms contain = 1 / 6.022 X 10²³ (2 ) = 3.3 X 10²² moles


2) 02 ( oxygen molecule = 2 atoms of oxygen
1 mole = 18 grams = 6.023 X 10²³ molecules = 2 X 6.022 X 10²³ atoms = 12.02 x10²³ atoms
now moles contain = 1 / 12.02 x10²³ X 2 = 1.67 x10²² moles

I mole of H2 contains =12.02 X 10²³ atoms
moles contain 1 / 12.02 x10²³(2)= 1.67 X 10²² moles