A compound composed of only carbon and hydrogen has a density of 5.55 g/L at 40.0 °C and 1.25 atm. v Correct. What is the formula mass of the compound? formula mass = g mol1 114 Hint Incorrect. What are the possible combinations of C and H that add up to that molar mass? O 3 C and 78 H O 8Cand 18H O 2 Cand 90H O7 Cand 30H O 5 Cand 54H O 1C and 102 H O 9 Cand 6 H O 6Cand 42H O 4C and 66H

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Q: What is Angas for the following equation? N2O4 (g) =2 NO2 (g) 2 O -1 O -2 O 3 O 1

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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.