Excited vs. Ground state masses of atom

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In a gamma decay process, an excited neon atom emits a gamma-ray with an energy of 1.630 MeV. The ground state mass of the neon atom is 19.992 435 u. To find the mass of the excited neon atom, the relevant formula connecting energy and mass is needed, specifically E = mc². This formula can help convert the emitted gamma-ray energy into mass. Understanding this relationship is crucial for determining the mass of the excited state.
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1. In a certain gamma decay process, an excited neon atom emits a gamma-ray that has an energy of 1.630 MeV. The neon atom in the ground state has a mass of 19.992 435 u. What is the mass of the excited neon atom?



2. I am pretty lost here. There must be a formula relating these energies to masses somewhere, but I do not know it.
 
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Try E = mc2.
 

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