Question

What is the mass of one Curie of$U^{234}$

• A. $3.7\times {10}^{10}gm$
  
• B. $2.348\times {10}^{23}gm$
  
• C. $1.44\times {10}^{-11}gm$
  
• D. $6.25\times {10}^{-34}gm$

Answer 1

The correct option is C $1.44\times {10}^{-11}gm$


1 curie = $3.71\times {10}^{10}$ disintegration/sec and mass of $6.02\times {10}^{23}$ atoms of $U^{234}=234gm$
$\therefore$ Mass of $3.71\times {10}^{10}$ atoms $=\frac{234\times 3.71\times {10}^{10}}{6.02\times {10}^{23}}=1.44\times {10}^{-11}gm$