Question

mine the molarity of a solution formed by dissolving 468 mg of Mg 2 in enough water to yield 50.0 ml. of solution. A) 0.0297 M B) 0.0337 M C) 0.0936 M D) 0.0107 M E) 0.0651 M 8) How many molecules of sucrose (C12H22011, molar mass 342.30 g/mol) are contained in 14.3 mL of 0.140 M sucrose solution? A) 8.29 x 1022 molecules C12H22011 B) 1.21 x 1021 molecules C12H22011 C) 6.15 x 1022 molecules C12H22011 D) 1.63 x 1023 molecules C12H22011 E) 5.90 x 1024 molecules C12H22011 9) Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K25 and Fe(NO3)2 are mixed. A) K+(aq) + NO3- (aq) → KNO3(s) B) Fe2+(aq) +52-(aq) + 2 K+(aq) + 2NO3-(aq) → FeS(s) + 2 K+(aq) + 2 NO3(aq) C) Fe2+(aq) + 52 (aq) + 2 K+(aq) + 2NO3- (aq) → Fe2+(aq) +52-(aq) + 2 KNO3(s) D) Fe2+(aq) +52-(aq) → FeS(s) E) No reaction occurs. 10) Write the net ionic equation for an acid-base neutralization reaction: 11) Which of the following is an acid-base neutralization reaction? A) C(s) + O2(e) → CO2(6) B) 2 HClO4(aq) + Ca(OH)2(aq) → 2 H2O(l) + Ca(ClO4)2(aq) C) Fe(s) + 2 AgNO3(aq) → 2 Ag(s) + Fe(NO3)2(aq) D) MgSO4(aq) + Ba(NO3)2(aq) → Mg(NO3)2(aq) +BaSO4(s) E) None of the above are acid base reactions.

Answer 1

☺ 7. no. of males of MQ I ₂ = mass of Mg I2 Mw of raq Iz = 468 mg x 0.001g KzS () + Fe (NO3) (28) fe s (+ . 2 kalią (aa) NEI Sonic EQN. IS 1 mg s” (as) + Fe}*(as) → FeS () * (25)+ oH (09) — HO (l) 2 Held (s) + Ca (01(25)+ Q4,0 () + Go (Chalees 248.11 gmoet = 1.68x10 s moe Molarity = No of moles of SOLUTE volume of SOUHON = 1.68 xio? moe - 10.0337 91 ® 500ml x 0.001L 1 ml NO. OF moles of SUCROSE = MOLairy * volume (1) R = 0.140 mol x 14.3 ml x 0.001L 1 mL = 2.00 x id mol 1 mol Sucrose HAS 6.02 x 1023 moliules 2.00 xió? mol Of SucRole ltas = 2.00 x 10 mol x 6.02 x 10 1 moe (1.20x10 molecules / -3 23