You have 0.476 moles of NaNO3. How many molecules are in this sample

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?

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?

At element makes up all organic compounds?