Question

27) What is the concentration (molarity) of HCI in the final solution when 65 mL of a 9.0 M HCl solution is diluted with pure water to a total volume of 0.15 L? 28) How many milliliters of a 9.0 M H2SO4 solution are needed to make 0. 45 L of a 3.5 M solution? A) 0. 18 mL B) 1.2 mL C) 180 mL D) 1200 mL 29) A student prepared a stock solution by dissolving 15.0 g of KOH in enough water to make 150. mL of solution. She then took 15.0 mL of the stock solution and diluted it with enough water to make water to make 65.0 mL of a final solution. What is the concentration of KOH for the final solution? A) 0. 411 M B) 0.534 M C) 1.87 M D) 2.43 M 30) The mixing of which pair of reactants will result in a precipitation reaction? A) Mg(NO3)2(aq)+ Na2CO3(aq) B) K2SO4(aq) + Cu(NO3)2(aq) C) NaClO4(aq)+ (NH4) 2S(aq) D) NH4Br(aq) + NH41(aq) 31) What volume (in mL) will a sample of F2 gas occupy in a syringe at 5.5 atm, if the F2 has a volume of 25.0 mL at 1.2 atm? A) 11 mL B) 17 mL C) 3.8 mL D) 5.5 mL E) 7.6 mL 32) If a sample of 0.29 moles of Ar occupies 3.8 L under certain conditions, what volume will 0.66 moles occupy under the same conditions? A) 12 L B) 8.6 L C) 17 L D) 5.0L E) 15 L

Answer 1

Hal solution Initially Finally Molarity (Mi) = am Molarity (M) = 2 Volume (Vi) = 65ml Volume (V₂) = 0.15L So: 15x103 me =150 ml dilution law M, V, = MV & M₂ = MIUI substitute the values (9M) (65 me) - 1som - ME M = 3.9M Final HCl solution concentration = 3.97 Initially 1. Finally Mi=qM 3.5M Vi = ? ů = 6.456 = 450 ml

V = (3.5M) (4.50m) qM V = 1750) A 115 ml of am H. 504 required to make 0.452 of 3.5m solution