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Dissolve 15.0 ml pure ethanol C2H5OH (density = 0.789 g/mL) in enough water to produce 250.0 mL solution.
Consider an amphoteric hydroxide, M(OH)2(s), where M is a generic metal. Estimate the solubility of M(OH)2 in a solution buffered at pH = 7.0, 10.0, 14.0
While a 1.150 g sample of iron ore is treated with 50.0 ml of HCl the iron dissolves in the acid to form a solution of FeCl3. The FeCl3 solution is diluted to 100.0 ml and the concentration of Fe3+ ions is determined by spectrometry to be 0.095 mo..
How much energy (heat) is released when 1.52 moles of H2 reacts with 0.68 moles of Cl2 to create HCl(g) if the ΔHrxn = -184.6 kJ.
Calculate the molar concentration of OH - ions in an 01.33 M solution of hypobromite ion, BrO- (Kb = 4.0 10-6).
For which of the following reactions does Hrxn representan enthalpy of formation. C(s) + O2(g) -> CO2(g) CO2(g) + C(s) -> 2 CO (g) CO2(g) + H2(g) -> H2O(g) + CO(g) 2 H2(g) + C(s) -> CH4(g)
Compute the work for a system that absorbs 150 kJ of heat in a process that leads to an increase in internal energy of 120 kJ. Is a work done on or by the system during this change? Explain your reasoning
list at least four themes by which enzymes interact with substrate to lower the transition state
Solid potassium nitrate is decomposed by heating to give potassium nitrite and oxygen gas. If 1.00g of potassium nitrate is heated, what is the milliliter volume of oxygen gas at STP
Problem- Experimentally, acetate buffer HC2H3O2-C2H3O2^- can be prepared in different ways. Calculate the approximate pH of an acetate buffer solution prepared by mixing equal volumes of 0.10 M HC2H3O2 and 0.10 M NaC2H3O2 (Ka, HC2H3O2 = 1.8 x 10^-5..
The healthcare giver recommends that she take the Benedict's test. Presume that the glucose levels of the patient are high. Define the composition and the properties of the ketohexose derived from fruit jam.
Spectroscopists have observed He+ in the outerspace. This ion is a one-electron species lik ea neutral hydrogenatom. Calculate the energy emitted for the transition from the n =5 to the n = 3 state in this ion using the equation:
How many grams of pure solid PbCl2 could be formed from the reaction of 5.176 g of lead with excess HCl?
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