Question

How is a homogeneous mixture of co2 and h2 possible when co2 is heavier than H2

Answer 1

I'd be careful applying the word miscibility to gases. It's just not that useful since the vast majority of gases are basically miscible. A mixture of oil and water as liquids will separate out into different phases, but as gases (maybe because of higher temperature or lower concentrations) they'll have zero problems with remaining mixed. Intermolecular forces are just never really strong enough to cause phase separation, so miscibility just isn't useful to explain anything about gases.
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