An atom has 19 protons and 20 neautrons. Which of the following could be the symbol for that atom, including its mass number

What volume of a 2.00 m stock solution of naoh is needed to prepare 150. ml of 0.40 m solution?

An alkaline battery produces electrical energy according to the following equation. zn(s) + 2 mno2(s) + h2o(l) zn(oh)2(s) + mn2o3(s) (a) determine the limiting reactant if 17.5 g zn and 31.0 g mno2 are used. (type your answer using the format ch4 for ch4.) (b) determine the mass of zn(oh)2 produced. _ g

In a reaction (at equilibrium) that makes more moles of gas than it consumes, what is the effect of increasing the pressure?