In which species does sulfur have the highest oxidation number? S_2 H_2S SO_2 SO
ID: 505765 • Letter: I
Question
In which species does sulfur have the highest oxidation number? S_2 H_2S SO_2 SO_4^2+ To make 450.0 ml of 0.990 M diluted lead nitrate solution, how many mL of 3.45 M stock solution are needed? 109 mL 129 mL 101 mL 56 mL Based on the activity series, which one of the reactions below will occur? Zn(s) + MnI_2 rightarrow ZnI_2(aq) + Mn(s) SnCI_2(aq) + Cu(s) rightarrow Sn(s) + CuCI_2(aq) 2 AgNO_3(aq) + Pb(s) rightarrow 2Ag(s) + Pb(NO_3)_2(aq) 3 Hg(I) + 2 Cr(NO_3)_3(aq) rightarrow 3Hg(NO_3)_2 + 2Cr(s) The value of delta H degree for reaction below is -126 kJ. __________ kJ of heat will be released when only 2.00 mol of NaOH is formed through the reaction? 2 Na_2O_2(s) + 2 H_2O(l) rightarrow 4 NaOH(s) + O_2(g) 252 63 3.9 7.8 Consider the following two reactions: A rightarrow 2B delta H degree = 456.7 kJ A rightarrow C delta H degree = -22.1kJ Determine the enthalpy change for the process: 2B rightarrow C -478.8 kJ -434.6 kJ 434.6 kJ 478.8 kJ A sample of iron absorbs 67.5 J of heat, upon which the temperature of the sample increases from 21.5 degree C to 28.5 degree C. If the specific heat of iron is 0.450 J/g degree C, what is the mass (in grams) of the sample? 4.3 11 21.4 1100 In a titration of 35 mL of .737 M H_2SO_4, how many mL of a .827 M KOH solution is required for neutralization. H_2SO_4(aq) + 2 KOH_(aq) rightarrow K_2SO_4(aq) + 2 H_2O_(t) 35.0 1.12 25.8 62.4 A 50.0-g sample of liquid water at 25.0 degree C is mixed with 29.0 g of water at 45.0 degree C. The final temperature of the water is ________ degree C? 32.3 102 27.6 35.0Explanation / Answer
Q24.
S8 = 0, elemental state
H2S --> -2 since H = +1
SO2 --> S + 2*(-2) = 0 --> S = +4
SO4-2 --> S + 4(-2) = -2 --> S = -2 + 8 = +6
clearly, the highest is in sO4-2
Q25
Apply Dilution law
M1*V1 = M2*V2
450*0.99 = 3.45*V
V = 450*0.99/3.45 = 129.13 mL
Q26
activity series:
a)
Zn2+ + 2 e Zn(s) 0.7618
Mn2+ + 2 e Mn(s) 1.185
Clearly, Zn will form a solid, i.e. reduce, so this will not occur as it is shown
b)
Sn2+ + 2 e Sn(s) 0.13
Cu2+ + 2 e Cu(s) +0.337
Copper will reduce,
Copper will form the solid, so this will not occur!
c)
Ag is the most stable, so Ag will form the solid ( it reduces) this is correct as it is shown
D)
Hg22+ + 2 e 2 Hg(l) +0.80
Cr3+ + 3 e Cr(s) 0.74
Clearly, Hg will be reduced, so it form solid, then the reaction shown is inverted, that is, it will not occur as it is shown
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