Question

the no. of atoms in 20g of so3 is approximately?

Answer 1

mol wt of so3 is 80 hence no of atoms in 20 g are 20/80 ×6.022 ×10^23

Answer 2

Molecular mass of SO3 --- 32+3x16=80 Unified mass

Molar Mass=80gm

Given weight of SO3=20g

Number moles=given weight/gram molecular weight=20/80=1/4=0.25 moles

So 1 mole =80 gm of SO3 contains 6.023x 10²³ moelcules

0.25 moles[20g] conatins -----?

=6.023x10²³x0.25

=1.50x10²³ moleucles

Each moleucle of SO3 has 4 atoms.

so,Total number of atoms in SO3 is 4x1.50x10²³ 

=6x10²³ atoms

∴Total number of atoms in SO3 is 6x10²³ atoms

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