Question

MCQ

Answer 1

Answer:

1.014×10²³ atoms

Explanation:

Given data:

Volume of tungsten = 1.6 cm³

Density of tungsten = 19.35 g/cm³

Number of atoms of tungsten = ?

Solution:

First of all we will calculate the mass of tungsten.

density = mass/volume

by putting values,

19.35 g/cm³ = mass/1.6 cm³

Mass = 19.35 g/cm³× 1.6 cm³

Mass = 30.96 g

Number of moles of tungsten:

Number of moles = mass/molar mass

Number of moles = 30.96 g/ 183.84 g/mol

Number of moles = 0.1684 mol

1  mole contain 6.022×10²³ atoms.

0.1684 mol × 6.022×10²³ atoms / 1mol

1.014×10²³ atoms