Calculate the number of moles in 5.37 x 10 19 atoms of Iron.
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Which of the following is most likely true about water in chemical systems? a) water dissolves nonpolar ionic compounds. b) water dissociates ionic compounds. c) water dissociates covalent molecules. d) water dissolves nonpolar covalent substances.

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?

Calculate the mass of 0.750 mol of the following substance. na3po4. , i'm not quite sure on how to set up the problem to solve! : (