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Consider the following thermochemical equations : 8Mg(s) + Mg(NO3)2(s) ? Mg3N2(s) + 6MgO(s) ?H°rxn = -3884 kJ Mg3N2(s) ? 3Mg(s) + N2(g) ?H°rxn = +463 kJ 2MgO(s) ? 2Mg(s) + O2(g) ?H°rxn = +1203 kJ Use the above equations to calculate the ?H°f (in kJ/mol) of solid Mg(NO3)2. A. -222 kJ/mol B. -188 kJ/mol C. +94 kJ/mol D. -94 kJ/mol E. +188 kJ/mol
How many milliliters of a stock solution of 10.0 M HNO_3 would you have to use to prepare 0.320 L of 0.550 M HNO_3?
How long will it take to deposit 0.00470 moles of gold by electrolysis of KAuCl4 (aq) using a current of 0.214 amperes? Which metal would be suitable to provide cathodic protection from corrosion for an iron bridge?
Describe the characteristic IR absorption frequencies in cm -1 that would allow you to distinguish between the following pair of compounds.
The compound aluminum chloride is widely used to control chemical reactions in industry. It is made by the following reaction: Al2O3(s) + 3C(s) + 3Cl2(g)→ 2AlCl3(s) + 3CO(g)
A compound contains only carbon, hydrogen, nitrogen and oxygen. Combustion of 0.314 g of the compound produced 0.426 g CO2, and 0.0620 g H2O
a 25 mL sample of .150 M hypochlorous acid is titrated with a .15 M NaOH solution. What is the pH after 26 mL of base is added? The Ka of hypochlorous acid is 3.0x10^8
The voltage generated by the zinc concentration cell described by, Zn(s)|Zn2 (aq, 0.100 M)||Zn2 (aq, ? M)|Zn(s) is 28.0 mV at 25 °C. Calculate the concentration of the Zn2
Find the value of Pressure - How much more pressure will the gas exert if the temperature is raised to 44.1°C?
What mass of this substance must evaporate in order to freeze 230 of water initially at 24? (The heat of fusion of water is 334 the specific heat of water is 4.18 .)
The forensic technician at a crime scene has just prepared a luminol stock solution by adding 10.0 g of luminol to H2O creating a solution with a total volume of 75.0 mL. What is the molarity of the stock solution of luminol?
Propose a structure for an amine of formula C4H9N, which does not liberate a gas when treated with NaNO2 and HCl, and has IR absorptions at 917 cm-1, 990 cm-1, and 1640 cm-1,
As a chemist for an agricultural products company, you just developed a new herbicide,Herbigon, that you think can kill weeds effectively. A sparingly soluble salt,
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