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210Po decays to give alpha particles and 206Pb with a half life of 138.4 days. If...

210Po decays to give alpha particles and 206Pb with a half life of 138.4 days. If 1 g 210Po is placed in a sealed tube how much helium will accumulate in 69.2 days? Express answer in cm^3 at STP.

The answer is 31.248cm^3 please show steps to solve

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