21. 10.00 wt% HCl(aq) solution has a density of 1.0474 g/mL. Convert weight perc

Question

21. 10.00 wt% HCl(aq) solution has a density of 1.0474 g/mL. Convert weight percent to molarity. 22. Use structure arguments to identify the strongest acid in this group: HFO, HCIO, HBrO, HIO. 23. In this reaction, should we expect the reactants or the products to be favored? H ,504(aq) + CO32-(aq)-HSO.(aq) + HCO?(aq) Choices: Reactants favored a lot (almost complete reaction), Reactants favored somewhat (equilibrium), Products favored a lot (almost complete reaction), Products favored somewhat (equilibrium) 24. Consider 0.65 mol H2 and 0.65 mol 12 placed in a 1.0 L stainless-steel flask at 430°C. Calculate the equilibrium concentrations of H2, 12, and HI. H2(g) + 2(g) 2 HI(g) Ke 64.0 at 430°C

Explanation / Answer

21)

weight % = 10.0 %

density = 1.0474 g/mL

Molarity = wt % x density x 10 / molar mass

            = 10 x 1.0474 x 10 / 36.45

Molarity = 2.874 M

22)

strongest acid = HFO

electronegativity increases , acidity is also increases. F has more electronegative among all.

23)

products favoured somewhat

24)

H2 (g) + I2 (g)   <--------------> 2 HI (g)

0.65       0.65                                0

0.65 - x   0.65-x                           2x

Kc = (2x)^2 / (0.65-x)^2

64 = (2x)^2 / (0.65-x)^2

8 = 2x / 0.65 - x

5.2 - 8x = 2x

x = 0.52

equilibrium concentrations :

[H2] = 0.13 M

[I2] = 0.13 M

[HI] = 1.04 M

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