A chemistry graduate student is given 300 mL of a 0.20 M ammonia (NH3) solution. Ammonia is a weak base with Kb = 1.8 x 10^-5.
(a) What mass of NH4Br should the student dissolve in the NH3 solution to turn it into a buffer with pH = 9.10?
You may assume that the volume of the solution doesn't change when the NH4Br is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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"you didn't chose the stud life. the stud life chose you."

the right answer is c i just did the question.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.