1) Ultraviolet is classified into UV-A, UV-B, and UV-C, and the boundary between UV-A and UV-B is 0.0000315 cm. Convert this value to a) nanometers and b) inches.
1) Ultraviolet is classified into UV-A, UV-B, and UV-C, and the boundary between UV-A and UV-B is 0.0000315 cm. Convert this value to a) nanometers and b) inches.
2) The gasoline tank of my car can hold a maximum of 55.0 liters of gasoline. How many pounds (lb) of gasoline can it hold, if the density of the gasoline is 0.560 g/mL?
3) An aquesou solution of amuminum sulfate is mixed with an aqueous solution of barium chloride. Write the molecular, complete ionic and net ionic equations of this reaction.
4) If you mix 20.0 g of hot water at 90.0 °C with 30.0 g of cold water at 20.0 °C, what is the final temperature of the system?
5) Draw the Lewis structures for O3 and CO32−. What are their molecular structures?
6) A compound has an elemental composition: 25.45 % Cu, 12.84 % S, 4.036 % H, and 57.67 % O. Determine the empirical formula of the compound.
7) Calculate ΔE for each of the following and mention if they are exothermic or endothermic processes depending on the sign of q.
(a) q = +47 kJ, w = −29 kJ
(b) q = −23 kJ, w = +47 kJ
8) Given the following information,
2Cu(s) + O2(g) → 2CuO(s) ΔH = −314.6 kJ/mol
2NO2(g) → N2(g) + 2O2(g) ΔH = −66.4 kJ/mol
Calculate the value of ΔH for the equation
4Cu(s) + 2NO2(g) → 4CuO(s) + N2(g)
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