The chemical formula for rubies is ai2o3 list the elements that combine to form a ruby and the number of atoms of each element in a single molecule of the gem ?

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?

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.

Selective reactions allow for synthetic control of chemical reactions. different orderings of selective reactions can yield different products. the following three-step reaction takes advantage of selective reactions. give the product that is produced after each of the three steps.