What is the molar mass of homogentisic acid
A 5.96-g sample of homogentisic acid, a weak organic acid having Ka=4.0 x 10^-5, is dissolved in 35.0 mL of water and its pH is measured to be 2.20. What is the molar mass of homogentisic acid?
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Two samples of calcium flouride are decomposed into their constituent elements. The first sample produced 1.64 g of calcium and 1.56 g of flourine. If the second sample produced 294 mg of fluorine, how many g of calcium were formed?
The rivets are 10 mm in diameter, spaced a distance s = 24.4 mm apart, and have an average shear strength of 35 MPa. Determine the maximum internal pressure in MPa if the rivets are not to shear.
Construct a 95% confidence interval estimate for the population proportion of adult cellphone owners who report that they use their phone to keep themselves occupied during commercials or breaks in something they were watching on television.
500 mL of a gas is collected under the following conditions, Pressure = 750 torr and temperture = 24 degree celsius. What will the new volume be when the temperature is 341 K and the pressure is 4.9 atm?
A flu epidemic starts by one infected person in an isolated population of N individuals. Find the number of infected people as a function of time. How long will it take to infect the entire population.
For a hydrogen atom, calculate the energy of a photon in the Balmer series that results from the transition n = 3 to n = 2. The Rydberg constant is 1.0974 × 107 m-1. (h = 6.6262 × 10-34 J·s and c = 3.00 × 108 m/s).
A) what is the max tension in the cable supporting the elevator? B) if the elevator was accelerating downwards at a rate of .2g, what is the tension in the cable supporting the elevator?
What is the hydronium-ion concentration of a buffer solution that is .25 M Na2HPO4 and .40 M NaH2PO4? For H3PO4, (Ka1=6.9x10-3), (Ka2=6.2x10-8) and (Ka3=4.8x10-13).
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