There are 5 moles of N20 at STP. What is the density?

An experimental procedure requires a 10 ml of acid to be dissolved

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Word equation for k(s) +h2o(l) yield koh (aq) + h2