3what is the mass of 15.0 x1015 atoms of uranium?

Mass = 595  × 10⁻⁸ g

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