First, we need to find the mass of an ${ }^{16} \mathrm{O}$ atom in atomic mass units (amu). An ${ }^{16} \mathrm{O}$ atom has 8 protons and 8 neutrons, and since each proton and neutron has a mass of approximately 1 amu, the mass of an ${ }^{16} \mathrm{O}$ atom
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