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Beta carotene is the most important of the A vitamins. Its molar mass (g/mol) can be determined by measuring the osmotic pressure generated by a given mass of beta carotene dissolved in the solvent chloroform. Compute the molar mass of beta carotene if 10.0ml of a solution containing 7.68mg of beta carotene has an osmotic pressure of 26.57mmHg at 25.0 C.
explainnbsp the structure for 4-ethyl-23-dimethyl-2-heptene?using a sample of gas under a 622 kpa of pressure nbspand
If you were to carry out saponification of ethyl tridecanoate, would you expect the product to generate foam/froth when mixed and agitated with water
(a) What is the pH of this buffer (b) What is the pH of the buffer after the addition of 0.48 mol of NaOH. (assume no volume change) (c) What is the pH of the original buffer after the addition of 0.23 mol of HI. (assume no volume change)
if you start with 3.50g of aluminum 1.5ml of 1.4m potassium hydroxide and 25.0ml of 9m sulfuric acid with excess water
What was the percentage by mass of Mg(OH)2 in the original sample? [Hint: When Mg(OH)2 or Al(OH)3 reacts with HCl(aq), the products are a chloride salt, water and CO2(g). Assume that all of the CO2(g) leaves the solution without reacting.]
a small immersion heater is used to heat water for a cup of coffee. we wish to use it to heat 236 ml of water about a
A solution containing potassium bromide is mixed with one containing lead acetate to form a solution that is 0.013M in KBr and 0.0035 M in Pb (C2H3O2)2.
When an electron in a hydrogen at moves from the n = 6 to the n = 2 shell, a photon is emitted. What is the wavelength
Compute the molar mass of the noble gas krypton(Kr) in a natural sample, which is 2.2% 80 Kr (molar mass 79.91 g/mol),
The total molarity of acid and conjugate base in this buffer is 0.100 M . A student adds 7.90 mL of a 0.440 M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.760
A robust first grader goes for swimming lessons three times a week, and he enjoys it thoroughly. During the first week of December, he develops an upper respiratory infection, starts coughing continuously, and has a high fever of 39°C. His conditi..
For Stronium oxide, SrO, the solubility in water is 0.69 g per 100mL at 30 degrees C and 22.8g per 100 mL at 100 C. Write the equation for the solubility equilibrium, including heat as a reactant or product
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