0.60 g of hydrogen is allowed to react with 4.00 g oxygen to form water. 2 H2(g) + O2(g) → 2 H2O(l) (Relative atomic masses: H = 1.0, O = 16.0) (a) Which chemical is in excess? _______________________ (b) Calculate the amount of H2O(l) formed.

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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.