How long does it take a person at rest to breathe
How long does it take a person at rest to breathe one mole of air if the person breathes 78.0 mL/s of air that is measured at 25 degrees Celcius and 755 mmHg?
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Why is it that Van der Waals can be used to describe the behavior of a real gas? What is the rationale for the equation used and how are the parameters determined?
Salt, NaCl, has a solubility of 35-7g per 100g of water at 0 degree celsius. The solubility of salt in water does not vary appreciably with temperature.
For each of the following three questions 25.0 mL of 0.100 Mpyridine (Kb = 1.70 x 10-9) istitrated with 0.100 M HCl. For each question calculate the pH ofthe final solution after the indicated amount of HCl has been added.
Verify your estimate by calculating the concentration of CO2 gas that is in the equilibrium with solid CaO and solid CaCO3 at 25C.
What are the resonance structures and intermediates in the formation of bromoacetanilide from the reaction of acetanilide and bromine liquid with acetic acid?
A 65 g ice cube at 0°C is heated until 40 g has become water at 100°C and 25 g has become steam at 100°C. How much energy was added to accomplish the transformation?
Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. A solution containing 8.25 g of sodium carbonateis mixed with one containing 6.00 g of silver nitrate.
A standard solution of 0.243 M NaOH was usedto determine the concentration of a hydrochloric acid solution. If46.33 mL of NaOH is needed to neutralize10.00 mL of the acid, what is the molar concentration of the acid?
What is the pH at the equivalence point when when 25.0 mL of 0.189mol/L HN3(aq) is titrated with 0.123 mol/L NaOH(aq)?Assume the temperature is 25oC. (For HN3,pKa=4.72 at 25oC).
Oxygen makes up 46.7% by mass of the Earth's crust. How many grams of oxygen are present if a sample of the crust has a mass of 325 g?
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