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The lethal doses (expressed in ppm by volume) of two gases A & B are the same and equal to 20 ppm. Indicate how many mg of each gas would be needed to reach the lethal concentration in a room of 46m^3. The molecular masses of A and B are 300Da and 30 Da. Assume ideal gas behavior normal atmospheric pressure, and 25C temperature.
a 75.0 ml sample of .0500M HCN is titrated with .500 M NaOH. what is the concentration of H+ in the solution after 3.0 ml of .500 M NaOH has been added
When o.514 g of biphenyl (C12H10) undergoes combustion in a bomb calorimeter, the temperature rises from 25.8 to 29.4 degree Celcius. Find delta energy reaction for the combustion of biphenyl in KJ/mol biphenyl.
A white precipitate formed when the barium hydroxide solution was mixed with the sulphuric acid. *Mass of filter paper=0.96g *Mass of filter paper and precipitate=5.25g
How would a Dietary resin that absorbs bile salt reduce plasma cholesterol level( please give me a detailed biochemistry explanation
How would you prepare 350mL of a single solution containing 150mM Tris, 5mM glucose, and 5 mM Nacl?
Milk of magnesia is often taken to reduce the discomfort associated with acid stomach or heartburn. The recommended dose is 1 teaspoon, which contains 4.00×102mg of Mg(OH)2.
a solution of NaOH is added to the supnatant liquid until it is strongly alkaline. No precipitate is formed. Which ions are present in each of the precipitates. Which cations are not present in the original solution?
Dry ice (solid ) has occasionally been used as an "explosive" in mining. A hole is drilled, dry ice and a small amount of gunpowder are placed in the hole, a fuse is added, and the hole is plugged.
Which of the following has the smallest mass?
25.0mL of a 0.100M solution of NH3 is titrated with 0.150M HCl. After 10.0mL of the HCl has been added, the resultant solution is: a) basic and before the equivalence point
What is the function of EACH of the following components in a membrane phospholipid? Fatty Acids, Glycerol
Examples are BrCl, IBr, BrF, and ClF. Which compound is expected to have the highest boiling point aqt any given pressure? Please explain why
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