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Question:
An aqueous solution is 13.0 % by mass ethanol, CH3CH2OH, and has a density of 0.978 g/mL.
The mole fraction of ethanol in the solution is.
The density of acetonitrile (CH3CN) is 0.786g/ml, and the density of methanol (CH3OH) is 0.791g/mL . A solution is made by dissolving 21.5 mL (CH3OH) in 98.9 mL CH3CN. a) What is the mole fraction of methanol in the solution
24.3 g of magnesium yield 40.3 g MgO upon combustion with oxygen. How much magnesium needs to be burned to yield 12.1 g Mgo
Explain how many grams of AgNO3 are needed to precipitate all the bromide in 250mL of the Hbr solution
Kw=1.0E-14. A sample of 0.1355g of an unknown monoprotic acid was dissolved in 25.0mL of water and titrated with 0.0950 M NaOH. If the acid required 19.3mL of base to reach the equivalence point, what is the molar mass of the acid
State the equilibrium constant expression in terms of reactant as well as product concentrations for the following reactions
the solubility of silver sulfate in water is 0.223 wv at 35degc. calculate the solubility product of this salt at this
Classify the following systems as either open, or closed andthermally insulated, or thermally connected, or isolated. a) Hot coffee in a cup
derive the internal pressure for a dieterici gas. justify physically the form of the expression obtained e.g. what are
Sodium peroxide (Na2O2) is often used in self-contained breathing devices, such as those used in fire emergencies, because it reacts with exhaled CO2 to form Na2CO3 and O2.
All of the following are factors that affect reaction rate EXCEPT a. density of reactants b. presence of a catalyst
Draw a concentration cell for 0.10 M Cu2+ and 2.0 M Cu2+ cell, show the following on each compartment clearly. a) All the component of each cell, including the concentrations in anode and cathode half cells.
A buffer solution is prepared by mixing enough acetic acid and potassium acetate to give 500ml of a solution that is 0.500 M acetic acid and 0.500 M potassium acetate. What is the pH of this buffer
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