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Question: What is the mass of one Curie of U<sup>234</sup>...

What is the mass of one Curie of U234

A

3.7 × 1010gm

B

2.348 × 1023gm

C

1.48 × 10–11gm

D

6.25 × 10–34gm

Answer

1.48 × 10–11gm

Explanation

Solution

1 curie = 3.71 × 1010 disintegration/sec and mass of 6.02 × 1023 atoms of U234=234gmU ^ { 234 } = 234 \mathrm { gm }

∴ Mass of 3.71 × 1010 atoms

=234×3.71×10106.02×1023=1.48×10−11gm= \frac { 234 \times 3.71 \times 10 ^ { 10 } } { 6.02 \times 10 ^ { 23 } } = 1.48 \times 10 ^ { - 11 } \mathrm { gm }