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8.00 L of argon is allowed to expand at 21.0 ° C to a volume of 25.0 L. If the pressure remains constant, what is the final temperature (in degrees Celsius)?


Oxygen is produced by plants during photosynthesis and used by plants and animals for respiration. Predict the chemical amount of oxygen in 12.0L of air at TAPN. Suppose the air is 20% oxygen.


Sulfur hexafluoride, SF6 (g), serves as a chemical insulator. A 5.0 L sample of this gas was collected at 205.0 ° C and 350 kPa. What pressure must be applied to the gas sample to reduce its volume to 1.7 L if the temperature is 25 ° C?


A balloon contains 46.3 L of Helium at 42 oC, and 2.01 atm is released into the air. At a certain altitude, the temperature falls to 21 oC, and the pressure falls to 0.25 atm. What is the volume of the balloon under these conditions?


A. 3.5 L

B. 35.0 L

C. 350 L

D. 3500 L

E. None of the Above


Maria is completing her homework when she comes across a question that reads "write the chemical formula for copper oxide". But she doesn't know how to proceed. She thinks there are two answers to this question. What further information would she need from the question? What are the two possible compounds that can be made? Show their formulas.


calculate the Ph of the solution formed when 500cm3 of 0.1moldm-3 of weak acid HX is mixed with 500cm3 of 0.2moldm-3 solution of its salt NaXKa =0.004 moldm-3

An Aspirin tablet contains 1.25x1030 molecules How many moles of this compound are present in the tablet


The rate of a standard reaction is 0.00543 M/s at 40 oC. What will the rate be if the temperature is doubled?


A. 0.0109 M/s

B. 0.0217 M/s

C. 0.0434 M/s

D. 0.0869 M/s

E. All of the Above


Which of the following statements is correct regarding the use of a funnel in the top of a volumetric flask?

Use a funnel of a size that will not cause the flask to become top-heavy and unstable.

Use a stemless funnel.

Use as large a funnel as possible to prevent splashing some of the contents.


Use the following information: A container has 8360.0 torr of Nitrogen, 5.000 atm of Oxygen, 101.3 kPa of Argon, and 760.0 mm Hg of Carbon Dioxide.


What is the mole fraction of Oxygen?


A. 0.1673

B. 0.2670

C. 0.2778

D. 0.4675

E. 0.5782



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