A given sample of n2 gas has a pressure of 0.30 atm at 30.0 °c. if the volume is 2.0 l, then moles of n2 are present is 0.002.
PV=nRT
n=PV/RT
n=0.30×2÷0.82×298
n=0.6/244
n=0.002 mol
The mole concept is a helpful way to quantify the amount of a substance. When dealing with particles at the atomic (or molecular) level, it is known that even one gramme of a pure element contains an enormous number of atoms. The mole concept is frequently used in this context. The most popular unit of measurement is the "mole," which is a count of a significant number of particles. The number 6.02214076*1023, also known as the Avogadro constant, is frequently denoted by the letter "NA". Among the elementary entities that can be represented in moles are atoms, molecules, monoatomic and polyatomic ions, as well as other particles (such as electrons).
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