0 kg of $^{238} \mathrm{U}$. We can do this by using the molar mass of uranium-238, which is 238.51 g/mol.
The number of moles in 1.0 kg (or 1000 g) of uranium is given by:
\[ \text{Number of moles} = \frac{\text{Total mass}}{\text{Molar mass}} = \frac{1000 \,
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