Question

Calculate the number of molecules in 109.5 g of HCl. [H = 1, Cl = 35.5]

  • Mole Concept
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Answer

Gm mol. wt. of HCl = 1 + 35.5 = 36.5 g

36.5 g of HCl = 6.023 × 1023 number of molecules

Therefore, 109.5 g of HCl = 6.023 × 10^{23}\over 36.5×109.5

= 109.5\over 36.5×6.023 × 1023

Hence, number of molecules in 109.5 g of HCl is 3 × 6.023 x 1023

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