A gaseous phase reaction A2 to B +0.5C ...

A gaseous phase reaction `A_2 to B +0.5C` shows an increase in pressure from 100 mm to 120 mm in 5 min. Now, ` - (Delta [A_2])/(Delta t)` should be

`8mm-"min"^(-1)`

`4mm-"min"^(-1)`

`16mm-"min"^(-1)`

`2mm-"min"^(-1)`

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