Question

Molar concentration 1. How many of NaCl is in 2002 M solution Atomic N C 2. How many of 0.25 M solution can be prepared from 20 g of N . Alemi mass Na-23 8. Oog.Hulg 3. How many ml of water must be added to 600 ml of 0.5 M KCl solution 4 M solution? Atomis mass: K:19. C1-35.5g Ans. 150 4. 200 ml of 0.5 M solution of NaCl was added to 300 ml of 2M solution of NCL What is the molar concentration of the mixture? Ans. 0.12 M 5. What is the molar concentration of 3% NaCl solution? At ma: Na2 0.163.H-1 6. What is the percent concentration of 0-2 M K SO, solution? Atomic mak 9S. 328, 0.16g 7. Calculate the yield of the following reaction Caco, Coco, if 7.54 g of CaO was obtained from 16 g of CaCO Ans. 84% & Calculate the yield of the following reaction: N2 + 3H -2NH if mixing 14 g of N with 8 g of He gave 11 g of ammonia As 64.79

Answer 1

mic Mass of NA = 939, CI:35:59 molceulomass sum of mom of each molecular manos moro of Nat! moles = mass taken .99, CI = 3 sg . . apo mom of each alom mero of Nat mass of c1 23385, -58 Molarmente molarity o mokes/volume (12) we can say 10000 2 of Nacel contain 0.2 moles 0:2ND NAC contain = 02/1000 moles am 2 0 2100 200 - 0.04 moles I mote. weighs 458.5g in 0.04 mole weighs 20.04*58:52 - 2.34 g. 2) Atomic Anass Na - 239, 169, H g Malay mam of NaoH o ss of Na + mart mass teken (m) - 207) moss of Na + mass of of mano H23+1+16 24 3 . Pritial (M.) Notarity = 0.5 k Volume - 600 m z mas, lāksu/molar moms 2 se 0.5 moles Macarity moles (wolumen in (1) polarity = Ox25m Volume = moles/Molarity of moles/0.25 mol/L = 2000 mp; [il - lodomi] 2000 m final m Molarity = 0.4M of key .. Volume (V2) - Volume of kar +VH2O - Datam using Min, a M2²2 OS X 6005 014X a 300 m X X014 b * = 3:00 = 750ml final volume = Tsome so ml of wali added a V-V, = 750 ml-600m 200ml of 0 SM of NAC 300 ml LO no of moles, poo me op 0.5M of NaCl = 0.5 moles 1000 ml of 0-2 Mol Nau's 0.2 moles M O SMNACI = 015/ou molos muy 0.2 MOP Nach o /1000m 200 mal OSM MAC -0.5X200 ml 300 m op 02.Mos Nau 20:2/1000 mm x 200 0.1 moles Total moleshenoh, 0:+0.660 = 16 moles 16 moles nav. +V2 - 200 ml + 300 ml room 20.al Total volumel) - V+V2 = 200 mil to 300 C's Scanned vaith molus n 16 moles Smoles - 0.32M Molaneyanner Volume 0.5 L :