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Alpha helices are a kind of secondary structure in proteins. Explain what is the length of a 31-kDa single-stranded ?-helical protein segment? Presume a mean residue mass of 110 Da.
Calculate the mass of a 1m3 parcel of dry air at STP. Calculate its mass at the same pressure but at 10 ?C and 20 ?C.
potassium metal is very reactive with liquid bromide. the result of the reaction is the formation of a ionic solid.
Write the balanced molecular equation for the combustion of methanethiol in an excess supply of oxygen.
A mixture of NACI and sucrose of combined mass of 10.2 g is dissolved in enough water to make up 250 mL solution. The osmotic pressure of the solution is 7.32 atm at 14*C. Calculate the mass percent of NACI in the solution.
Why does bromine add faster to a disubstituted double bond than a monosubstituted double bond to produce dibromides
a tank contains a mixture of 2 mol Cl2, 5 mol O2, and 3 mol CO2 at 0 C and under a total pressure of 1 atm. calculate the partial pressures of each gas in the mixture
an adult person radiates heat to the surroundings at about the same as a 100-watt electric incandescent lightbulb. what is the total amount of energy in kcal radiated to the surroundings by an adult in 24 hours?
Arrange the following solutions in order of decreasing freezing point: 0.20 m Fe(OH)2, 0.15 m C6H6, 0.10 m K3PO4, 0.15 m CH3COOH, 0.35 m KBr.
The order of skunks is caused by chemical compounds called thiols. These compounds, of which butanethiol(C4H10S) is a representative example, can be deodorized by reaction with household bleech (NaOCl) according to the following equition:
a mass of .1 kg of helium fills a .2m3 rigid vessel at 350 kpa. the vessel is heated until the pressure is 700 kpa.
A mixture containing 0.232 mol He(g), 0.163 mol H2(g), and 0.161 mol N2O(g) is confined in a 22.00 L vessel at a constant temperature. The total pressure is 1.16 atm. Calculate the mole fraction of N2O(g) in the mixture.
How many moles of H2 can be produced from x grams of Mg in magnesium-aluminum alloy? The molar mass of Mg is 24.31 g/mol
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