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A sample of the sugar d-ribose (C5H10O5) of mass 0.727 g was placed in a calorimeter and then ignited in the presence of excess oxygen. The temperature rose by 0.910 K. In a separate experiment in the same calorimeter, the combustion of 0.825 g of benzoic acid, for which the internal energy of combustion is -3251 kJ mol-1, gave a temperature rise of 1.940 K. Calculate the internal energy of combustion of d-ribose and its enthalpy of formation.
write a electrn configuration for an octahedral complex, write the electron configuration for [RhCl6]^-3 in terms of MO labels for ground electronic state.
What is the weight percent concentration of sodium carbonate in your unknown if it takes 37.25 mL of 0.1018 M hydrochloric acid to reach the second equivalence point of the titration
a fixed quantity of gas at 21 exhibits a pressure of 730 and occupies a volume of 4.40. use boyles law to calculate the
A 11.6-g sample of CaCl2 is dissolved in 139 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat capacity of 4.18 J/°C ..
Concentrated HCl was added to a Ca(OH)2 suspension (in water) and the precipitate dissolved. Explain this observation on the basis of a Le Chatelier's shift in the equilibrium.
A 0.200 M solution of a weak monoprotic acid HA is found to have a pH of 3.00 at room temperature. What is the ionization constant of this acid?
What is the buffer strength (ie the total of Ha and A). The concentration of weak base in the buffer on 0.126 M The concentration of weak acid in the buffer is 0.04906
Draw a circuit diagram that subtracts two inputs signals and then amplifies the subtracted signal
Calculate the value of ?So in J/K for the combustion of 1 mole of propane to form carbon dioxide and gaseous water. S (C3H8(g)) = 271.3 S (O2(g)) = 203.1 S (CO2(g)) = 212.9 S (H2O(g)) = 188.0
What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers
Assuming electrons with quantum numbers (n,l,mt,ms), how does an electron with the quantum numbers (2,1,1,+1/2) differ from an electron with quantum numbers (2,1,-1,+1/2)?
A sample of CO2 gas which weighs 1.62 grams has a volume of 1.02 liters when collected at 20°C. What would be the pressure of the gas sample
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