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.^(60 m)Co rarr .^(60)Co emits gamma-rad...

`.^(60 m)Co rarr .^(60)Co` emits `gamma`-radiations of wavelength `3 xx 10^(-10)`. Assuming each nuclei emits one wavelength, with what mass per mole of two nuclei differ?
a. `4.43 xx 10^(-9) g` b. `4.43 xx 10^(-4) g`
c. `4.43 xx 10^(-3) g` d. `4.43 g`

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