What mass, in grams, of NO2 is needed to form 195.4 g of NO? Assume excess water.

Answer 1

Where is the equation? Are you referring to

3 NO2 + H2O → 2 HNO3 + NO ?

If so, convert 195.4 g of NO to moles.

The moles of NO2 needed will be 3 times that (see balanced eq)

Finally, convert moles NO2 to grams using tge molar mass of NO2