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Calculate ΔHrxn for the combustion of octane by using enthalpies of formation from Appendix IIB in the textbook. The standart enthalpy of formation of C8H18 is -250 kJ/mol.
When 2.45g of an unknown weak acid (HA) with a molar mass of 85.0g/mol is dissolved in 250.0g of water, the freezing point of the resulting solution is -0.258 degrees C.
Determine the pH of the solution after the addition
A free electron initially at rest at the back of Cathode ray tube in your television accelerate through a potential
A particular reaction has a ?Ho value of -155 kJ and ?So of -282 J/mol K at 298 K. Assuming that ?Ho and ?So hardly change with temperature, determine the temperature in K at which the spontaneity of this reaction changes.
A 25.00 mL sample of a sodium hypoclorite liquid bleach is placed in a 250 mL volumetric flask and diluted to the mark. A 25.00 mL aliquot of this solution is placed in a 250 mL Erlenmeyer flask.
Wind is another name for atmospheric circulation patterns. Atmospheric circulation patterns keep the temperature of an area constant. Atmospheric circulation patterns are often responsible for hurricanes.
An electron drop to what energy level is likely to emit a photon of red light?the secondthe firstthe third
A mixture of 0.10 mol of NO, 0.050 mol of H2 as well as 0.10 mol of H20 is placed in a 1.0L vessel at 300K. The subsequent equilibrium is established 2NO(g)+2H2(g) N2(g) and 2H20(g) at equilibrium [NO]=0.062M.
Question- The nuclear fusion of a lithium-7 nucleus and nuclide X releases two alpha particles and a neutron. Identify nuclide X.
Calculate the OH concentration of a solution of Na2CrO4 0.225M. (the sodium salt of chromic acid). (Chromic acid is H2CrO4, a diprotic acid, Ka1= 1.80x10^-1, Ka2=3.20x10^-7 & Kw=1.00x10^-14).
Why does finding a straight line relationship help you to understand the nature of the relationship between transmittance and concentration?
The equivalence point was reached by adding 11.62 ml of NaOH from the buret. What is the molar mass of this unknown acid
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