The diameter of a carbon atom is 0.154 m. what is this number expressed in scientific notation?

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

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?

What is the empirical formula for c4h8o2