Question

--- (3 points) Which of the following should have the highest conductivity? a. 3.0 M NaCl b. 2.4 M CaCl2 c. 3.2 M NH4NO3 d. 2.1 M Na3PO4 (2 points) You have an aqueous solution containing lead(II), sodium, iron(III), and potassium ions. You need to devise a way to separate the ions from one another. Which of the following statements is NOT correct regarding your method? a. Sodium and potassium cannot be separated by precipitation. b. Lead(II) ions can be precipitated as PbCl2 by adding a source of chloride ions. c. Iron(III) ions can be precipitated as Fe(OH)3 by adding a source of hydroxide ions. d. Sodium and potassium can be separated by precipitation of potassium with sulfate ions. 3. (3 points) Write a balanced chemical equation for the reaction of aqueous solutions of ammonium sulfate and sodium hydroxide. a. (NH4)2SO4(aq) + 2 NaOH(aq) → 2 NH4+(g) + Na2SO4(aq) + 2 OH-(aq) b. (NH3)2SO4(aq) + 2 NaOH(aq) → 2 NH3(g) + Na2SO4(aq) + 2 OH-(aq) c. (NH4)2SO4(aq) + 2 NaOH(aq) → 2 NH3(g) + 2 H2O(l) + Na2SO4(aq) d. (NH3)2SO4(aq) + NaOH(aq) → 2 NH3(g) + NaOHSO4(aq) (3 points) The complete combustion of 0.20 moles of propane, C3H8, will a. consume 0.20 mol O2 and produce 0.20 mol CO2. b. consume 0.20 mol O2 and produce 0.40 mol CO2. consume 1.0 mol O2 and produce 0.80 mol CO2. consume 1.0 mol O2 and produce 0.60 mol CO2. c. d 5. (3 points) Which of the following pairs of molecules have the same oxidation number for carbon? a. CH4 and CC14 b. CO and CO2 C6H1206 and C(s) d. H2CO and COCI2

Could you please explain in detail how to do these questions? Thank you in advance.

Answer 1

1 ) we have to consider number of ions x concentration, higher the number higher will be conductivity.

( a ) 3 x 2 = 6

( b ) 2.4 x 3 = 7.2

( c ) 3.2 x 2 = 6.4

( d ) 2.1 x 4 = 8.4

correct answer is ( d )

2 ) answer is ( d ) since K₂SO₄ does not form precipitate.

3 ) balance reaction is option ( c ) .it is neutralisation reaction.

4 )

u Cale + 502 3cą + 44,0 0.2 mol 0.2x5 0.2x3 = 1 mol = 0.6 mol correct answer is edo fy Iran con el color X f2 (a) Hafta Ora H-CH O alaci tu correct answer is (c)