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An aqueous solution containing 35.8 g of an unknown molecular (nonelectrolyte) compound in 156.7g of water was found to have a freezing point of -1.4 degrees C. Calculate the molar mass of the unknown compound.
How much heat is released when 75 g of octane is burned completely if the enthalpy of combustion is -5500 kJ/mol C8H18? C8H18 + 25/2 O2 --> 8CO2 + 9H2O
What weight of sodium formate must be added to 400mL of 1M formic acid to produce a buffer solution that has a pH of 3.50
The steam is comes out of the feed water at 200 C. The water at a flow rate of 500 kg/h enters the feed water heater at 20C. Calculate the feed water exit temperature.
If you have a solution of 0.15 M solution of HC2H3O2and 0.13M NaC2H3O2, a. What type solution is it? b. What is the pH
at 25degc hydrogen iodide breaks down very slowly to hydrogen and iodine ratekhi2. the rate constant at 25degc is 2.4
If a 0.10M solution of HA has a pH of 5.83 at 25 degrees C, what is deltaG0 for the acid's dissociation at 25 degrees C
dry-cleaning solvent (molecular weight = 146.99 g/mol) that contains C, H, and Cl is suspected to be a cancer-causing agent. When a 0.133 g sample was studied by combustion analysis, 0.239 g of CO2 and 0.0323 g of H2O formed. How many moles of eac..
the specific heat of ethylene glycol is 2.42 J/g-K. How many J of heat are needed to raise the temperature of 62.0 g of ethylene glycol from 13.1 C to 40.5 C ?
If the ion of element X has a mass number of 230 and has 86 electrons, what is the identity of the element? How many neutrons does it have?
What is the hydronium-ion concentration of a 4.07 10-4 M solution of p-bromobenzoic acid, BrC6H4COOH, for which Ka = 1.00 10-4
An unknown solid compound containing Pb2+ ion was mixed with 15 mL of 2.0 M HNO3. The mixture bubbled profusely. After complete reaction, it was found that 0.020 moles of CO2 were produced and the original solid was completely consumed.
What is the structure of the compound
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