How many molecules of NH3, are present in a sample of 100.0 grams

How are elements arranged in a periodic table

When hydrochloric acid reacts with potassium hydroxide solution, the following reaction occurs. hcl (aq) + koh (aq) h2o (l) + kcl (aq) the reaction gives off heat energy, so it is an reaction.

Which of the four hypothetical substances you investigated would be most harmful to living organisms? 50 points!