Answers

2016-03-29T21:53:46+05:30
 1) Atomic mass of Na is 23 
     46÷23 = 2 moles 
    1 mole = 6.02 × 10²³           
     2×6.02×10²³ = 1.2 × 10*24
 
2) Atomic mass of o2 is 32
    8÷32 = 0.25 moles
    0.25×6.02×10²³= 1.51 × 10²³

3) 0.1 ×6.02×10²³= 6.02 ×10²³

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