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Earth has a mass of 5.98 × 1024 kg. The average mass of the atoms that make up Earth is 40 u. How many atoms are there in Earth?

  • physics - ,

    atomsnumber=5.98E24/massoneatom

  • physics - ,

    it didn't work

  • physics - ,

    If ME is the mass of Earth, m is the average mass of an atom in Earth, and N is the number of atoms, then

    ME = N · m or N = ME/m.

    Thus,
    N =ME/m= (5.98 × 10^24kg) / ((40u)(1.661 × 10^−27kg/u)) = 9.0 × 10^49

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