Given: The number of moles of HCl = 0.1. The number of particles in one mole = 6.022 × 1023. The mass of one mole of any substance is its molar mass, so the mass of one mole of HCl = 1 + 35.5 = 36.5g.
How many moles are there in HCl?
Using periodic table you can find molar mass of HCl, which is 36.458 g/mol. This means 1 mol of HCl is 36.458 grams. So 20 g of HCl is 0.548 mol.
How many grams are in 1 mole of HCl?
Thus, for hydrochloric acid, 1 mole is equal to 36.5 grams of HCl.