Course Contents»... LA G Liquid hellum at 4.2 K has a density of 0.147 g/mL. Suppose that a 1.00 L metal bottle at 80 K contains air at 2.0 atm pressure. If we introduce 150.0 mL of liquid hellum, seal the bottle, and allow the entire system to warm to room temperature (25°C), what is the pressure inside the bottle (in atmospheres)? Submit Answer Tries 0/99

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Q: Calculate the pH of a 3.11 M solution of KA given that  for the acid:  HA Ka = 4.21⋅10−44.21⋅10-4

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Q: Calculate the OH concentration and pH of a 3.6 x 10-³ M aqueous solution of sodium cyanide, NaCN,…

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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.