Question

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

• A. $3.7\times {10}^{10}g$
• B. $3.7\times {10}^{-10}g$
• C. $6.25\times {10}^{-34}g$
• D. $1.438\times {10}^{-11}g$

Answer 1

The correct option is D $1.438\times {10}^{-11}g$

$1$ curie $=3.7\times {10}^{10}$ atoms/sec

Mass of $3.7\times {10}^{10}atoms=\frac{234\times 3.7\times {10}^{10}}{6.02\times {10}^{23}}=1.4374\times {10}^{-11}g$