Question

1. High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressures used in this procedure range from around 500 kilopascals (500,000 Pa) to about 60,000 kPa (60,000,000 Pa). It is often convenient to know the pressure in torr. If an HPLC procedure is running at a pressure of 2.40×108 Pa , what is its running pressure in torr? Express the pressure numerically in torr.

2.40×10^{8} Pa = ______ torr

2. A sample of gas has an initial volume of 3.89 L at a pressure of 709 mmHg. If the volume of the gas is increased to 5.36 L , what will the pressure be? (Assume constant temperature.) __________?

3. Use the ideal gas law to complete the table:

P |
V |
n |
T |

1.07 atm | 1.26 L | 0.102 mol | ___ |

119 torr | ___ | 0.240 mol | 307 K |

___ | 28.3 mL | 1.81×10^{−3} mol |
25.1 ∘C |

0.563 atm | 0.442 L | ___ | 251 K |

3a. Complete the first column. P=_____ atm

3b. Complete the second column. V= ______ L

3c. Complete the third column. n= ______ mol

4d. Complete the fourth column. T=_______ K

Answer #1

1. How many moles of gas must be forced into a 4.8 L tire to
give it a gauge pressure of 32.4 psi at 30 ∘C? The gauge pressure
is relative to atmospheric pressure. Assume that atmospheric
pressure is 14.5 psi so that the total pressure in the tire is 46.9
psi . Express your answer using two significant figures. n = _____
mol
*** different kind of question***
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