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A sample of sugar D-ribose (C5H10O5) of mass 0.727g was placed in a calorimeter and ignited in the presence of excess oxygen. The temperature rose by 0.910K. In a separate experiment in the same calorimeter, the combustion of 0.825g of benzoic acid, for which the internal energy of combustion is -3251kJ mol-1, gave a temperature rise of 1.940K. Calculate the internal energy of combustion of sugar D-ribose and it's enthalpy of formation.
what are the concentrations of [NAD+] and [NADH] in the cells? Under oxidative stress condition, the cellular redox potential is shifted to -290 mV. What will be the concentrations of [NAD+] and [NADH] in this cell under this oxidative stress cond..
The radius of the Earth is approximately 6370 km. if one could dig down straight towards the center of the Earth, one would find that the innermost 3480 km (the core) has an average density of about 11.g/cm^3.
Calculate pCd2 at each of the following points in the titration of 55.00 mL of 0.0020 M Cd2 with 0.0020 M EDTA in the presence of the auxiliary complexing agent NH3.
A glycerol solution weighing 153.2 mg was treated with 50.0 mL of 0.0899 M Ce4+ in 4M HClO4 at 60 degrees C for 15 min to convert glycerol into formic acid: C3H8O3 + 8Cefourplus + 3H2O ----> 3HCO2H + 8Cethreeplus + Fethreeplus
For the equilibrium PCl5(g) PCl3(g) + Cl2(g), Kc = 2.0 × 101 at 240°C. If pure PCl5 is placed in a 1.00-L container and allowed to come to equilibrium, and the equilibrium concentration of PCl3(g) is 0.13 M, what is the equilibrium concentration o..
if a sample of 4.17 L of ethane gas at 725 C is cooled to 175 C at constant pressure, what is the new volume?
Show the amounts in NIKE's accounting equation by calculating thevalue of NIKE's total assets, total liabilities and total shareholder's equity
A 195mg sample of a non-electrolyte isolated from throat lozenges was dissolved in enough water to make 10.0mL of solution at 25 degrees Celsius. The osmotic pressure of the resulting solution was 4.83atm. Calculate the molar mass of the compound.
Calculate the volume of all gases evolved by the complete oxidation of 0.390 of the amino acid alanine if the products are liquid water, nitrogen gas, and carbon dioxide gas; the total pressure is 1.01 ; and = 291.
If it takes 1250 J to raise the temperature of 33.5g of a substance 59 deg C what is the specific heat of the substance
What mass of precipitate will form if 1.50 L of concentrated Pb(ClO3)2 is mixed with 0.850 L of 0.190 M NaI? Assume the reaction goes to completion.
Lake Lianna is fed by two rivers, the Matthew and the Andrew. You have made careful water chemistry measurements throughout the year and found that the two rivers have the following pH and alkalinity
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