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. Calculate ∆H°rxn for each of the following:
(a) 2H2S(g) + 3O2(g) → 2SO2(g) + 2H2O (g)
(b) CH4(g) + CI2(g) → CCI4(l) + HCl(g) [unbalanced
Copper(I) oxide can be oxidized to copper(II) oxide: Cu2O(s) + 1⁄2 O2(g) →2CuO(s) ∆H°rxn = - 146.0 kJ
Given that ∆H°f of Cu2O(s) = -168.6 kJ/mol, what is ∆H°f of CuO(s)?
Stearic acid (C18H36O2) is a typical fatty acid, a moleculewith a long hydrocarbon chain and an organic acid group (COOH) at the end. It is used to make cosmetics, ointments,soaps, and candles and is found in animal tissue as part of manysaturated fats. In fact, when you eat meat, chances are that youare ingesting some fats that contain stearic acid.
(a) Write a balanced equation for the complete combustion ofstearic acid to gaseous products.
(b) Calculate ∆H°rxnfor this combustion (∆H°f = -948 kJ/mol).
(c) Calculate the heat (q) in kJ and kcal when 1.00 g of stearicacid is burned completely.
(d) The nutritional information for a candy bar states that oneserving contains 11.0 g of fat
and 100 Calfrom fat (1 Cal =1 kcal). Is this information consistent with your answer in part (c)?
10 cm^3 of a 5 x10^-3 mol dm^-3 sulfuric acid is added to an empty volumetric flask. It's pH is currently 2. The solution is the diluted so the total volume is made up to 100 cm^3 with distilled water, what is the new pH of the solution?
Analysis:
1. What will happen to your number of hits and misses if the marbles were twice as large? What if they
were half as large?
How many grams would 8.1 1021 molecules of sucrose (C12H22O11) weigh?
79g of zinc reacts of 82 g hydrochloric acid
The concentrated sulfuric acid we use in the laboratory is 98.0 percent H2SO4 by mass. Calculate the molality and molarity of the acid solution. The density of the solution is 1.83g/mL
if excess chlorine is added to 5.00 mL of 0.250 M H^2SO^4 what is the theoretical yield
