Which Statements are True? As you decrease the temperature of a gas, the volume will descrease. Standard condition for gases is 0°C and 1 atm pressure. Volume of a gas is directly proportional to pressure at constant temperature and number of moles. As volume increases pressure will decrease. As moles in a container increase, pressure will decrease. Volume of a gas is directly proportional to temperature in Kelvin at constant pressure and number of moles.

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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.