Use the problem below to answer the question:

how many grams of h2 would be formed if 34 grams of carbon reacted with an unlimited amount of h2o? the reaction is:

c + h2o → co + h2

what is the starting substance? yes or no

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?