How many atoms of mercury are required to produce 3.49 L of H2 gas (density = 0.0899 g/L
according to the balanced chemical reaction:
2Hg(l) + 2 HNO3(aq) → Hg2(NO3)2(aq) + H2(g)

219 grams of iron (iii) oxide reacts with excess carbon according to the reaction equation shown below. fe2o3 + c → fe + co2 after a scientist performs the chemical reaction they find the actual yield of iron to be 57.4 grams. calculate the percent yield of this chemical reaction.

State two physical properties of ionic compound

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.