Answer:
Mass = 595 × 10⁻⁸ g
Step-by-step explanation:
Given data:
Number of atoms of uranium = 15.0 × 10¹⁵ atoms
Mass of uranium = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
1 mole of uranium = 6.022 × 10²³ atoms of uranium
1 mole × 15.0 × 10¹⁵ atoms / 6.022 × 10²³ atoms of uranium
2.5 × 10⁻⁸ moles
Mass of uranium:
Mass = number of moles × molar mass
Mass = 2.5 × 10⁻⁸ moles × 238 g/mol
Mass = 595 × 10⁻⁸ g