Question

calculate the number of particles in each
the following
a) 4g of Na
b) 8g of O2

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Answer 1

Explanation:

with a hope that you will understand..!!

Answer 2

Explanation:

a) atomic mass of Na= 23

23g=1mol

4g=xmol

23x=4

x=4/23=0.174 mol

1 mole has 6.022x10^23 particles

4g has x moles which has has 0.174x6.022x10^23 particles

b) atomic mass of o2=32g

32g=1mol

8g=x mol

32x=8

x=1/4 mol

8g oxygen has (1/4) x 6.022x10^23 particles