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a nitrogen gas from a 24.0 L container with the pressure of 2atm and an oxygen gas from a 12.0 L with a pressure of 2atm and 273K were mixed together in a 10.0 L container. what are the partial pressure exerted by each gas in the mixture and what is the total pressure? use ideal gas formula and mole fraction.
Draw the structure of an example of the following steroids and briefly describe their biological functions
a)adrenocortical hormone
b) bile acid
The following reaction evolves 1389 kj of heat energy to the surrounding when 25.0h of CH4 is combusted with excess O2 as follows: CH4 + 2O2 = CO2 + 2H20

what is the enthalpy of reaction (deltaH) in kilojoules per mole of methane?
If the kinetic parameters of the uninhibited Cytochrome P450 3A4 are; KM = 2.36 µM and Vmax = 3.87 pM/min and the inhibition constant of fluconazole for Cytochrome P450 3A4 is KI = 9.21 µM, how much slower is the initial reaction rate of the break-down of Compound X (MW 300g/mol) (blood concentration: 6 µg/ml) by Cytochrome P450 3A4 in the presence of Fluconazole (blood concentration: 5 µg/ml)?
Air contains 20%by volume of oxygen. The volume of air required for the complete combustion of 1L of methane under the same conditions is
1. Calculate the mass of water produced when 9.44 g of butane reacts with excess oxygen.
2. Calculate the mass of butane needed to produce 99.5 g of carbon dioxide.
Calculate the pH of a 0.01moldm-3 solution of propanoic acid which has a constant of 1.34x10-5 moldm-3
A) Write the structure of Nylon 6,6 and circle the amide linkage
B) Give the names and structures of the two monomers involved
C) Mention the type of polymerization involved
D) Give the properties of the above polymer
The great majority of chemical reactions in nature are exothermic. As these reactions proceed, energy is liberated and the products have less energy than the original reactants. The products are also more resistant to change, more stable, than the original reactants. The tendency throughout nature is for a reaction to proceed in a direction that leads to a lower energy state. We might think that endothermic reactions, in which energy is absorbed, cannot occur spontaneously because the products are at higher potential energy and are less stable than the original reactants. They would be expected to proceed only with the assistance of an out- side influence, such as continued heating. However, some endothermic reactions do occur spontaneously. We conclude that something other than enthalpy change must help determine whether a reaction will occur?
A 0.424 g sample of liquid C5H12 was combusted completely using excess oxygen inside a bomb (constant volume) calorimeter, with the products being carbon dioxide and liquid water. The calorimeter's heat capacity is 4.782 kJ °C-1. If the temperature inside the calorimeter increased from 25.0 °C to 33.4 °C, determine ΔH for this reaction with respect to the system in kJ mol-1 at 298 K. Do not worry about how realistic the final answer is.

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