TUMS®, a form of calcium carbonate often needed after final exams, neutralizes stomach acid according to this reaction: CaCO3(s) + 2HCI(aq) → CaCl2(aq) + H2O(1) + CO2(g) (a) What volume of CO2(g) is produced at 1.00 atm and 37.0 °C when an excess of CaCO3 completely reacts with 605 mg of HCl? (Mm of HCl = 36.461 g/mol) (0.211 L) (b) Suppose the CO2(g) in part (a) was collected over water. What change would be made in the pressure value in your calculation? The vapor pressure of water at 37°C is 45.5 mmHg. (0.94 atm)

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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.