HAlf Life problem
Radon-222 has a half-life of 4.0 d (abbreviation for “diem”—Latin for
“day”). If the initial mass of the sample of this isotope is 6.8 g, calculate
the mass of radon-222 remaining in the sample after:
a) 8 d
b) 16 d
c) 32d
the awnsers are :
a) 1.7g
b)0.62g
c) 0.026g
i can't figure out how to do it

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You mean 0.42 for b?

no it is 0.62 for 6
this question is from a text book with given awnsers

Check it again.

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