A) \[6.2\times {{10}^{21}}\]
B) \[7.5\times {{10}^{21}}\]
C) \[1.25\times {{10}^{22}}\]
D) \[1.75\times {{10}^{22}}\]
Correct Answer: B
Solution :
[b] Half-life = 15 hrs. |
moles of Na |
No. of particles (disintegrations) |
moles |
no. of particles |
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