Answer:
3.74 x 10²² particles
Explanation:
Given parameters:
Mass of compound = 1.43g
Molar mass of compound = 23g
Unknown:
Number of particles of sodium = ?
Solution:
To find the number of particles of Na in the compound, we need to obtain the mass of sodium from the total mass given;
Mass of sodium = [tex]\frac{molar mass of Na}{molar mass of compound} x mass of sample[/tex]
= [tex]\frac{23}{23} x 1.43g[/tex]
= 1.43g
Now find the number of moles of this amount of Na in the sample;
Number of moles = [tex]\frac{mass}{molar mass}[/tex] = [tex]\frac{1.43}{23}[/tex] = 0.062mole
Now;
1 mole of substance = 6.02 x 10²³ particles
0.062 mole of substance = 0.062 x 6.02 x 10²³ particles
= 3.74 x 10²² particles
