how many grams of hydrogen are needed to add to phosphorus to make 345.0 grams of phosphine. I also need the steps on how to do this

22. a flask containing 450 ml of 0.50 m h2so4 was accidentally knocked to the floor. how many grams of nahco, do you need to put on the spill to neutralize the acid according to the following equation: h2so4(aq)+2 nahcos(aq) na,so(aq) +2 h20()+2 co2(g) d) 38 g a) 2.3 g b) 9.5 g c) 19 g

The identities of substances are the same before and after which type of change

The biosphere of the earth is made up of what compound? organic or inorganic?