4. A closed gas system initially has volume and temperature of 4360mL and 646.0C with the pressure unknown. If the same closed system has values of 0.689atm, 7670mL and 619K, what was the initial pressure in torr?

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Q: light used in gas chromatography- mass spectrometry? If so, how is it used?

A: Yes light can be used in GC-MS. The explanation is as follows:

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.