6. Calculate the mass of hydrogen formed when 27 g of aluminum reacts with excess hydrochloric acid according to the balanced equation below. 2A1+ 6HCI → 2 AICI3 + 3 H₂ a. b. c. d. e. 1.5 g 2.0 g 3.0 g 6.0 g 12 g 7. How many grams of nitric acid, HNO3, can be prepared from the reaction of 138 g of NO2 with 54.0 g H₂O according to the equation below? 3NO₂ + H₂O → 2HNO3 + NO a. b. C. 92 108 126

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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.