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A typical human cell is approximately 11.00 µm in diameter and enclosed by a membrane that is 7.00 nm thick.
(a) What is the volume of the cell including the membrane?
(b) What is the volume of the cell membrane?
(c) What percent of the total volume does its membrane occupy? To simplify the calculations, model the cell as a sphere.
A 5.13g sample of a solid containing Ni is dissolved in 20.0mL water. A 5.00mL aliquot of this solution is diluted to 100.0mL and analyzed in the lab. The solution was find out to contain 5.09 ppm Ni. Find the molarity of Ni in the 20.0mL solution..
Find the ph buffer that consists of 1.3 M sodium phenolate (C6,H5,O,Na) and 1.2 M phenol (C6,H5,OH) (pKa of phenol =10.00)
some physical properties of water are shown below.freezing point 0.00degcboiling
In the lower troposphere, ozone is one of the components of photochemical smog. It is generated in air when nitrogen dioxide, formed by the oxidation of nitrogen monoxide from car exhaust, reacts by the following mechanism.
N2(g) + O2(g) 2NO(g) If more NO is added bringing its concentration to 0.800 M define what will the final concentration of NO be after equilibrium is re-established
You obtain an unknown acid. You weigh out .856 grams of it and dissolve it in 45mL of water. You titrate it with 27.4mL of .5 M NaOH. What is the equivalent weight of the unknown acid
Caffeine is made up of 49.5% C, 5.2% H, 16.5%O, and 28.9% N. A solution made up of 8.25g of caffeine and 100.0 of benzene (d=0.887g/ml) freezes at 3.03C. Pure benzene (kf=5.10 degrees C/m) freezes at 5.50C.
For the reaction I_2(g)+Br_2(g)=2IBr(g), K_c=280 at 150 degrees Celsius. Suppose that .5 mol of I_2 and .5 mol of Br_2 is placed in a 1 L flask and allowed to reach equilibrium at this temperature. What are the equilibrium concentrations of I_2, B..
The acid-dissociation constant of hydrocyanic acid(HCN) at 25.0C is 4.9x10^-10. What is the pH of a aqueous solution of 0.080M sodium
In a 1cm cuvette, you measure a sample with an absorptivity constant of 10 L/mol•cm. The absorbance of the sample is 0.5. What is the concentration of the sample in moles/L
saturated steam at 300degc is used to heat a counter-currently flowing stream of methanol vapor from 65deg c to 260degc
what is the temp of the final solution after thermal equilibrium is established? The heat of neutralization -56kj/mol. Assume there is not heat lost to the surroundings. Also assume the specific heat of the solution is 1.0 Cal/g*c and the density ..
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