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In normal breath, about 0.5 L of air at 1.0 atm and 293 K is inhaled. About 25% of the oxygen in air is absorbed by the lungs and passes into the bloodstream. for a respiration rate of 18 breaths per minute, how many moles of oxygen per minute are absorbed by the body? Assume the mole fraction of ocygen in air is 0.21.
You are on the Starship Enterprise visitin an uninhabited planet. While investigating the surface of the planet, you come across a "nugget" of some type.
A sample of MgCl2 is known to be contaminated with NaCl. A 3.47-g portion of the sample is dissolved in water and treated with an excess of AgNO3 solution.
A dancehall contains 173 men and 238 women. A certain "promenade" calls for the formation of groups, with each group consisting of one man with two women. a)How many groups could be formed? b) which sex is in excess? By how much? (show calculation..
Which salt would make an acidic solution when dissolved in water a. rubidium diiodide b. aluminum tribromide c. potassion fluoride d. calcium sulfate Which would produce a basic solution in water
a buffer is prepared by combining 10.0 g of NaH2PO4 with 150 mL of 0.20 M NaOH and diluting to 2.0 L. what is the pH of the buffer? (Ka (H2PO4-)= 6.2 x 10^-8)
two thermometers a and b are wrapped in pieces of gauze. the gauze around thermometer a is moistened with water and the
What is the highest concentration of creatine that thermodynamically favors for phosphate group to be transferred from phosphocreatine to ADP? Assume T = 310 K. I know the answer is 45 I believe but how do you get it
The drying oven, although thought to be set at 125°C, had an inside temperature of 84°C. How will this error affect the reported percent by mass of the limiting reactant in the salt mixture. too high, too low, or unaffected
At what temperature does the numerical reading on a Celsius thermometer equal that on a Fahrenheit thermometer
which is exothermic as written. What would be the effect on the equilibrium position of increasing the volume of the reaction container
why are there variations in the weight of acid consumed for the same brand of antacid?
what vibrational bands would be prominent in the Ir spectra of 3-aminoacetophenone and 1-(3nitrophenyl) ethanol?at approximately what frequency
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