A quadrupole mass spec is operated under high vacuum at a pressure of 1.00 E -4 m bar . The mean path of an ion with a diameter of 1.928 nm at 22 C in a mass spec in meters-------?

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Sixta KovacekLv2

31 Dec 2019

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Related questions

Q1. 2-D quadrupoles

a. are typically used for high resolution, accurate mass experiments

b. are typically used for low resolution, high sensitivity experiments

c. are typically coupled to MALDI ion sources

d. are used with helium to cool ion motion to the center of the rods

Q2. An operating line

a. defines the ratio of RF and DC voltage used to make the quadrupole a mass spectrometer

b. defines the mass resolution of the instrument

c. regulates the ions that have stable trajectories through the rods

d. all of the above

Q3. A triple quadrupole mass spectrometer

a. operates at ultra-high vacuum (<10^-8 Torr)

b. are the most common type of tandem mass spectrometer

c. operate at high (kV) source voltage

d. none of the above

Q4. In RF-only mode, quadrupole filters

a. aid in transmitting ions from one place to another

b. are used as mass-selective devices

c. are better at trapping than hexapoles

d. are rarely used in mass spectrometry

Physical Chemistry II

1. Consider a 1.00 m3 tank containing pure N2 at 20.0Â°C and 5.00 bar. Assume the N2 molecules are rigid spheres with a diameter of 0.37 nm.

a) What is the mean free path of the N2 molecules in the tank?

b) What is the mean free path of N2 molecules at 20.0Â°C and 1.0 x 1036 torr (a typical pressure in a vacuum system)?

2. What is the pressure at the top of a 75.0 meter high cylinder containing CO2 at 25.0Â°C if the pressure at the bottom of the cylinder is 10.00 bar?

3. The thermal conductivity of CH4 gas at 25Â°C and 1 atm is 3.4 x 1034 J cm31 K31 s31. Estimate the heat per square centimeter that would flow in 10 minutes between two reservoirs as in figure 15.1 connected by a 25 cm long cylinder containing CH4 gas at 1.0 atm. Assume steady state conditions with T2=28Â°C and T1=24Â°C.