Which of these is a coefficent in this chemical equation? 3mg+n2 = mg3n2

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

Determine the percent sulfuric acid by mass of a 1.61 m aqueous solution of h2so4. %

Compare and contrast the bohr model and the electron cloud models of the atom.