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Find delta Hfor HCl(g) givenH-Cl bond enthalpy = +431 kJ·mol-1;DeltaH f H(g) = +217.9 kJ · mol-1;deltaH f Cl(g) = +121.4 kJ · mol-1.
A 3.77g sample of oxalic acid (H2C2O4x2H2O) was dissolved in enough water to make 1000 mL of solution. Then 17.15mL of this oxalic acid solution was titrated to the end point with 22.05mL of an unknown sodium hydroxide soloution.
Why might your sample not have the same melting range as either of the known compounds, given that it must be one of them?
A polarization potential arises from a concentration difference between ions in the neighborhood of the electrode and those in the bulk of the electrolyte solution. Calculate the polarization potential in a copper electro-refining cell given the f..
If a solution containing 17.76 g of mercury(II) perchlorate is allowed to react completely with a solution containing 5.102 g of sodium sulfate.
When 83.6 joules of heat is added to 2 grams of water at 10 degrees Celsius, the temperature of the water increases to what value?
In HPLC, how often should I need to run standard with samples? Why? If the retention time is changed with real samples compared to standard
Questions on chemical equations - Write a balanced equation for this reaction. Include the states of matter for each compound.
a photon of wavelength 40.0nm is used to eject an electron with the energy 22.3eV from a molecule.calculate the ionization energy of the molecule and tha associated wavelength of the elctron..
When making an alcoholic beverage, such as beer and wine, Brix is a measurement used to assess the amount of sugar present in the fermentation matrix or grape juice.
C2H6+O2 ---> CO2+H2O Calculate the mass of H2O that should form if 1.5 g of C2H6 is combusted in the presence of 2.5 g of O2.
How many moles of O2 are needed to burn 1.05 mol of C8H18
What mass of NaCl must be dissolved in 65.0 grams of water to lower the freezing point by 7.50 °C? The freezing point depression constant, Kfp, for water is -1.86 °C/m.
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