Question

calculate number of molecules in a drop of water waiting 0.09 gram​

Answer 1

no. of molecules = Na(no. of moles)

= 6.022×10²³ ( 0.09/GMM)

= 6.022×10²³ (0.09/18)

= 6.022×10²³ (0.005)

=~ 30×10^20

Also, it can be represented as 30Na × 10^-3

Answer 2

Number of moles =W/GMW

(gmw=gram molecular weight)

H2O GMW= 2×1+16=18

W=0.09(given)=9×10^(-2)

n=9×10^(-2)/18

n=10^(-2)/2

n=1/2×100=0.5/100

n=0.005moles

since 1 mole contains 6.023×10^23 molecules 0.005 moles contain 6.023×10^23 × (0.005) molecules

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