which one of the following pair has the same mass.

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3 + 7 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

which one of the following pair has the same mass:

1 mole of CO and 1 mole of CO2

1 mole of CO and 1 mole of N2

1 mole of O2 and 1 mole of CO2

1 mole of O2 and 1 mole of N2