Draw a circle around each station. Use the distance from the epicentre as the radius for each circle. Repeat for each seismic station.

That depends. cause the owl finished it in one lick

Hbr dissociates to form h+ and br-ca(oh)2 dissociates to form ca2+ and 2oh-the h+ and oh- react to form waterassuming the reactants are dissolved in water, the net reaction is h+ + oh- —> h2oif you’re asked to show all components of the reaction, the complete reaction is 2hbr + ca(oh)2 —> cabr2 + 2h2o

It will appear as o2(g) as a reactant 

Answer the molar mass of magnesium is 24.305g/mol.