Calcium hydride (CaH 2) reacts with water to form hydrogen gas: CaH 2 (s) + 2H 20 (1)→ Ca(OH) 2 (aq) + 2H 2 (g) How many grams of CaH 2 are needed to generate 12.4 L of H 2 gas at a pressure of 0.934 atm and a temperature of 23°C? (Molar Mass of CaH 2=42.09 g) O 10.0 O 8.25 O 11.6 O 14.2 O 6.23

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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.