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The complete combustion of salicylic acid releases 21.90 kJ of energy per gram of salicylic acid. In particular bomb calorimeter (initially at room temperature), the combustion of 0.1858 g of salicylic acid in the presence of excess oxygen, causes the temperature of the calorimeter to rise by 2.32°C. While a 0.3044-g sample of an unknown organic substance is similarly burned in the same calorimeter, the temperature raises by3.72 °C. Explain what is the energy of combustion per unit mass of the unknown substance?
Explain why a compound with a phosphate group whose free energy of hydrolysis is more negative can transfer phosphate to another compound to make a phosphorylated product whose free energy of hydrolysis is less negative.
If the equilibrium constant for a one electron redox reaction at 298k is 8.7*10^4, calculate the corresponding change in G and Ecell
The concentration of alcohol CH3CH2OH in blood, called the blood alcohol concentration or BAC, is given in units of grams of alcohol per 100mL of blood.
a mole of photons is called an einstein. calculate the radiant energy of an einstein if the photons have a wavelength
Nickel has a face-centered cubic unit cell. The density of nickel is 6.84 g/cm3. Calculate a value for the atomic radius of nickel. in picometers
A certain plant material is known to contain mainly trimyristin and tripalmitin in approximately equal amounts. Tripalmitin, the structure of which you should look up in a reference source,
What is the main component of the first eluting peak and what percentage of the total absorbance at 300nm is due to this component?(assuming the light path- length = 1.0 cm)
how many grams of aspirin were lost in the washing process you used to purify your product assuming you used 50 ml of
How do cells maintain a high regulation of cometing anabolic pathways, especially using glycolysis and gluconeogenesis
The refining of aluminium from bauxite ore proceeds by the overall reaction: 2Al2O3 + 3C --> 4Al + 3CO2.
How many photons are required to heat 295 of coffee from 25.0 to 62.0 ? Assume that the coffee has the same density, 0.997 , and specific heat capacity, 4.184 , as water over this temperature range.
The value of deltaH for the reaction CH3OH (l)---->CO (g) +2H2 (g) is +128.1 kJ? How many kJ of heat are consumed when 5.10 g of co (g) is formed as shown in the equation
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