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In 0.1 M HCl solution you have 0.1 mol per 1000 ml of solution.
Therefore number of moles per ml = 0.1 mol / 1000 mL
=0.0001 mol/ mL
Molar weight of HCl = 36.5 g per mol
Therefore weight of HCl in 1 mL = 0.0001 mol/mL x 36.5 g/mol
= 0.00365 g /mL
So it is false.
But 1 L of solution contains 3.65 g of Hcl.
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