Estimate the volume, v, of one sodium atom (na) using its metallic radius of 186 pm. express your answer with the appropriate units.

2.70x10^7 pm^3 We will assume that the sodium atom closely approximates a sphere. So the expression for the volume of a sphere is V = 4/3 pi r^3 V = 4/3 pi (186 pm)^3 V = 4/3 pi 6434856 pm^3 V = 26954261.78 pm^3 Round to 3 significant figures, giving 2.70x10^7 pm^3

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