Question

7. Calculate the molarity of the following: a) 2.0 mole HCl in 1.0L. b) 80.0 g NaOH in 4.0 L. c) 10.0 mole glucose in 2.0 L. 8.Calculate the volume needed of each solutions a) 10.0 moles of Mg(OH), of a 2.0M Mg(OH), solution. b) 0.5 mole of glucose of a 5.0M solution. c) 4.0 g NaOH of a 1.0M solution 9. What is the percent by mass of 75 g KBr dissolved in 575 g water? 10. What is the number of grams of zinc nitrate in 750.0 g of solution when the concentration is 25 %?

Answer 1

sto . Molarity :- mol/L) Number of moles of solute dissolve in one litre of solution is known as molarity (mol/l). I moles of solute (mol/L) volume of solation (2) (V). of mass of solute (9 (G) - moles molar mass of solute (g/mol) B (GMW) Sub es inego where M = molarity G= mass ne No.ob moles 'c Gram ve volume molecular weight. 7000 ♡ 2.0 mole Hel in LOL Me bo mot mol/L 1.0L 2.0 mol/ 1

b 80.0 g NaOH in lp.0L Naol molecular weighst 40 g/mol Mo 80.9 x 1000 (mol/L) 40 g/mol 4000 mL - 0.50 molle (e) 10.0 mole glucose in 9.0 L M (mol/L) 10.0 mol 2.0L = 5.0 mol/l