What theoretical mass of BaSO4 can be formed from 187g of H2O4

Which statement describes both homogeneous mixtures and heterogeneous mixtures?

When balancing a chemical equation:

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.