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What evidence is there that all cells have a common ancestor?
chlorobutenedioic acids dehydrochlorinate to give acetylene dicarboxylic acid. The Z reacts about 50 times faster
The steam is comes out of the feed water at 200 C. The water at a flow rate of 500 kg/h enters the feed water heater at 20C. Calculate the feed water exit temperature.
Calculate the pH of Benzoic acid if 0.0458 M is dissolved in water ( Ka = 6.40 x 10^-5) C6H5CO2H + H2O = (H3O+) + C6H5CO2 ^-1
Considering the Heisenberg's uncertainty principle, compute the uncertainty in the position of: a 1.50-mg mosquito moving at a speed of 1.40 m/s (if the speed is known to within a + or - 0.01 m/s)
a) Write the rate expression for this reaction. What is the rate appearance of D if the rate of dissappearance of A is 4.80x10^-6 M/sec?
What amount of H2 (in moles) is needed to inflate it to 1.0 atm in an ambient temperature of 25°C at sea level? mol. What mass can the balloon lift at sea level, where the density of air is 1.22 kg m-3? kg
How many kilojoules a) are required to raise the temperature of 33.4 g CH3CH2OH(l) from 19.6 to 49.8 C b) must be removed from a 325 g sample of CH3(CH2)6CH3(l) to lower the samples temperature from 82.4 to 31.6
a sodium thiosulfate na2s2o3 solution has a concentration of 0.175 m. an end point for this titration occurs when 48.94
the concentration of carbon monoxide in an urban apartment is48 mugm3. what mass of carbon monoxide in grams is present
At what concentration does hydrocyanic acid (ka= 4.9 x 10^-10) exhibit 0.05 percent ionization? Assume the temperature to be 25*C
What observed rotation is expected when a 1.18 M solution of (R)-2-butanol is mixed with an equal volume of a 0.590 M solution of racemic 2-butanol, and the resulting solution is analyzed in a sample container that is 1 dm long
Problem- Calculate the pH of a solution made by mixing equal volumes of a solution of HCl with a pH of 1.44 and a solution of HNO3 with a pH of 2.74. Assume the volumes are additive
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