Question

a) calculate the number of C atoms in 0.212 mol of C
b) calculate the number of SO2 hotels in 4.79 moles of SO2
C) calculate the moles of Fe in 2.41×10^22 atoms of Fe
D) calculate the moles of C2H6O in 9.81×10^24 molecules of C2H6O
I need help with these problems

Answer 1

All these problems are based on mole concept and can be solved by a simple formulla given below

No. of moles = number of particles / 6.022 X 10²³

Particles can be atoms , molecules ions etc

6.022 X 10²³ = Avagadroes number

(a) calculate the number of C atoms in 0.212 mol of C

Use above formulla

No. of moles = number of particles (atoms) / 6.022 X 10²³

Or number of atoms = No. of moles X 6.022 X 10²³

number of atoms =0.212 X 6.022 X 10²³ = 1.28 X 0²³

(b) The number of molecules in 4.79 moles of SO2 = 4.79 X 6.022 X 10²³ = 28.84 X  10²³

(c) calculate the moles of Fe in 2.41×10²² atoms of Fe

No. of moles = 2.41×10²² / 6.022 X 10²³ = 0.04 moles

D) calculate the moles of C₂H₆O in 9.81×10²⁴ molecules of C₂H₆O

Use above formulla

No. of moles = number of particles / 6.022 X 10²³

No. of moles = 9.81×10²⁴ / 6.022 X 10²³ = 16.29 moles