How many uranium atoms are there in 8.2 g

Question

of pure uranium? The mass of one uranium
atom is 4 × 10^−26 kg.

Answer 1

First, we need to convert the mass of uranium from grams to kilograms:
8.2 g * (1 kg / 1000 g) = 0.0082 kg

Now we'll divide the total mass of uranium by the mass of a single uranium atom to find the number of atoms:
0.0082 kg / (4 × 10^−26 kg/atom) = 2.05 × 10^24 atoms

So there are approximately 2.05 × 10^24 uranium atoms in 8.2g of pure uranium.