- What do the * and the # mean on the periodic table?

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How many moles are there in a 82.1 sample of aspirin, C9H8O4? The atomic mass of neutral nickel-60 is 59.93 amu. What is its mass in kilograms? ?? How to Calculate the standard entropy? Do I have a chachi in my popitsis? If the radius of a neutron is 1.0×10−13cm, calculate the density of a neutron in g/cm3. (volume of a sphere = 43πr3)?