A chemistry graduate student is given 250. mL of a 1.20 M pyridine (C3H3N) solution. Pyridine is a weak base with Kg = 1.7x10-9. what mass of CH3NHBr should the student dissolve in the CzHN solution to turn it into a buffer with pH = 5.41?
You may assume that the volume of the solution doesn't change when the CH_NHBr is dissolved in it. Be sure your answer has a unit symbol, and round it to
2 significant digits.
al
0
Х
?

Astudent made the lewis dot diagram of a compound shown. what is the error in the lewis dot diagram? a)an o atom should transfer all of its six electrons to mg because the formula is mgo b) both electrons of mg should be transferred to one o adam because the formula is mgo c) the electrons should be transferred from each o add him to capital mg because mg has fewer electrons d) the number of dots around mg should be four because it has to transfer two electrons to each o

The tilt of the earth's axis of rotation is responsible for the a) ocean's tides. b) size of the moon. c) brightness of stars. d) earth’s seasons.

Let the ed50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. if the ed50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mg