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At 25 degree C the heat of fusion of Al is 10.6 kJ/mol and the heat of sublimation is 326.4 kJ/mol. What is the heat of vaporization of Al at 25 degree C.
60.0 mL portion of of 1.70 M solution is diluted to a volume of 288 mili litres. A 144-mili litres portion of that solution is diluted using 115 mLili litres of H2O. Determine the final concentration.
A 5.0 ml sample of vinegar was titrated with 7.2 ml of 0.55 M NaOH. if the density of vinegar solution is 1.00g/ml, what is the mass percent of acetic acid present.
Given the following data H Cl bond enthalpy = +431 kJ/mol, ?Hf HCl(g) = -92.31 kJ/mol
if molarity of a 2000ml solution is 4.0M NaCl, how many moles of NaCl are dissolved in that solution.
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..
Find out the eq molar concentration of SCN- in the system.( Kc=[FeNCS2+]/[Fe3+][SCN-] =271.5)
when ethane (C2H6) is burned, how many grams of oxygen are needed to react with 477 grams of ethane?
If I add 1.65 L of water to 112 grams of sodium acetate...What is the molality of NaC2H3O2 in this solution?
When sodium carbonate reacts with hydrochloric acid, the carbonic acid that is formed immediately breaks down into carbon dioxide and water. What weight of sodium carbonate would have been present originally
What volume of 0.955 M HCl, in milliliters, is required to titrate 2.152 g of Na2CO3 to the equivalence point?Na2CO3(aq) + 2HCl(aq) ---> H2O(l) + CO2(g) + 2NaCl(aq)
The atomic weight of a newly discovered el- ement is 98.225 amu. It has two naturally occuring isotopes. One isotope has a mass of 96.780 amu. The second isotope has a per- cent abundance of 41.7%. What is the mass of the second isotope?
Calculate the quantity of gas, in moles, if 127 L at 55.0 C has a pressure of 11.35 kPa.
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