What substances is the most soluble in water?

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

1) this is the structure in the cell nucleus that houses a cell's genetic information

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.