Single Choice

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$$1.438\times { 10 }^{ -11 }g$$
Correct Answer

Solution

$$1$$ curie $$=3.7\times 10^{10}$$ atoms/sec
Mass of $$3.7\times 10^{10}\ atoms =\dfrac{234\times 3.7\times 10^{10}}{6.02\times 10^{23}}=1.4374\times 10^{-11} g$$

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