there are 2 hydrogen atoms.
it is right answer that is option B.
Answer:
39.1 g
Explanation:
In your case, 6.02⋅1023 atoms of potassium will be equivalent to one mole of potassium. Therefore, you can say that one mole of potassium has a mass of 39.1 g .
inital velocity (u) should be less
Well density is mass divided by volume. As an object expands, its mass remains the same while the volume increases. This means that you will be dividing the same mass by a larger number which will result in a smaller final number or density.