Q 21 and 22 please 7913) A solution was made by dissolving 4.05 g of a solute in 130:9 g of acetone. The solution boiled at 56.58°C. The boiling point of pure acetone is 55.95° C, and the Ks-1.71° C/m. What is the molecular weightof the solute?A) 80.3B) 105C) 12.7D) 14014) The decomposition of N₂Os(g)-NO2(g) + NO3(g) proceeds as a first order reaction with a half-life of30.0 seconds at a certain temperature. If the initial concentration [N:Oslo 0.400 M, what is theconcentration after 150 seconds?A) 0.400 MB) 0.100 MC) 0.025 MD) 0.013 M15) Which equation below best gives the concentration of N₂Os versus time in the previous question Q14?A) [N₂0s] ([N2Oslo)/t12 B) [N20₁] - ktC) [N20s]-[N2Osloe D) 1/[N20s] =1/[N20s]+ ktT16) The rate constant for the first order reaction A---> B+C is k-2.2 x 10 min-¹ at 57 K. What is thehalf-life for this reaction at 57 K?A) 9.1 minD) 1200 minB) 32 min17) Calculate AH° for the reaction: 2C) + 2H₂O) --->->C(s) + H₂OH2(g) + CO2(g)CH4) + H₂O(g)(1) CO(g) + H₂(g)(2) CO(g) + H₂O(g) --->(3) CO(g) + 3H2(g) --->C) 64 minCH4(g) + CO2(g)AH-150 kJAH-41kJΔΗ°==-206}JA) 53 kJB) 116 kJC) -372 kJD)-116 kJ18) When a strong acid is titrated with a weak base, the pH at the equivalence point is ALWAYSA) <7B) 79>7D) <119) Which is the weakest intermolecular force among a group of molecules of comparable molar mass?A) Dipole-dipoleB) LondonC) Ionic bondingD) Hydrogen bonding20)Given: N2(g) + 3 H₂(g) <-> 2 NH3(g)At equilibrium at a certain temperature, the concentration of NH3(g), H₂(g) and N₂(g) are 0.490 M, 1.41 Mand 0.14 M, respectively. Calculate the value of Ke for this reaction.A) 1.26B) 3.02C) 0.612D) 1.9621) Which one of these statements about strong base is trueA) Strong bases produce solutions with a higher pH than weak basesB) Bases have only the OH group in their structureC) Strong bases are very concentrated acidsD) Strong bases are 100% ionized in water22) Consider the reaction represented by the equation: Fe³+ (aq) + SCN- (aq) → FeSCN²+ (aq)6.00 M Fe³+ (aq) and 10.0 M SCN (aq) are mixed at a certain temperature and at equilibriumthe concentration of FeSCN2+ (aq) is 2.50 M.A) 295x10-3B) 303 x104D) 95 x10³C) 250x10423) Consider the following reaction: 4 PCB(g)-> P4(g) + 6 Cl2(g)If the initial concentration of PC13(g) is 3.0 M, and "x" is the equilibrium concentration of P4(g), what is thecorrect equilibrium relation?A) Kc = 6x7B) Kc=6x7/(3.0-x)+D) Kc=x7/(3.0-x)*C) Kc = (x)(6x)/(3.0-4x)*24) What is the density of NH3 at 5 atm pressure and a temperature of 35°C?C) 0.980 g/LB) 3.36 g/LA) 16.6 g/L25) What is the pH of 80.0 M aqueous solution of NH3 (ammonia). It's Kb = 1.8 x 10³.B) 1.98A)12.6C) 0.778D) 1.39 g/LD) 0.0104CAS

Answered: Image /qna-images/answer/57441488-f776-49a6-8a64-20068c2af822.jpg

A) 1.26 B) 3.02 C) 0.612 21) Which one of these statements about strong base is true A) Strong bases produce solutions with a higher pH than weak bases B) Bases have only the OH group in their structure C) Strong bases are very concentrated acids D) Strong bases are 100% ionized in water D) 1.96 22) Consider the reaction represented by the equation: Fe (aq) + SCN (aq) → FeSCN²+ (aq) 6.00 M Fe³+ (aq) and 10.0 M SCN (aq) are mixed at a certain temperature and at equilibrium the concentration of FeSCN2+ (aq) is 2.50 M. A) 295x10-3 B) 303 x104 C) 250x104 D) 95 x10³