radioactivity

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The ratio of ³₁H to ¹₁H in a sample of water is 8x10^-18 :1 ³₁H undergoes decay with a half life 12.3 years the number of tritium atoms would 9 g of the sample contain 40 years after the original sample is collected is

a)5.06x10⁵
b)6.02x10⁵
c)6.02x10²³
d)5.06x10²³

#Chemistry #Physical Chemistry

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Lokesh Verma ·2009-04-02 06:44:26

1/2 mole will contain

8x10^-18/2= 4x10^-18 moles =8x10^-18 x6.023x10²³
after 40 years it will become 1/8th...

so it will be 6.023x10⁵

around...

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