Sand is made up of silicon dioxide, sio2 (molar mass= how many silicon atoms are in a
smgle grain of sand weighing 55.2 micrograms?

5.54 × 10¹⁷ atoms

Explanation:

Given data:

Mass of sand = 55.2 μg (55.2 ×10⁻⁶ g)

Molar mass of sand = 60 g/mol

Number of atoms = ?

Solution:

Number of moles = mass/ molar mass

Number of moles = 55.2 ×10⁻⁶ g / 60 g/mol

Number of moles = 0.92 × 10⁻⁶ mol

Number of atoms:

one mole = 6.022 × 10²³ atoms

0.92 × 10⁻⁶ mol ×  6.022 × 10²³ atoms / 1mol

5.54 × 10¹⁷ atoms

56 moles of   lieter in chemistry

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.