2/+ 273K 1. A weather balloon is filled with 3.3 x 10 L of hydrogen at a temperature of 21 °C and a pressure of 745 torr. What is the volume of the balloon at a height of 15 km, where the temperature is -23 °C? Assume pressure is constant. a. 2.09 x 10" L V. 33, L b. 3610 L c. 2810 L d. 3880 L

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Q: 180 0.8 0.6 0.4 0.2 160 140 3000 120 2000 Wavenumber (cm-1) 100 Solvent 80 60 1000 40 20 ppm

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Q: #Q "

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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.