a hene laser was created in which the mole fraction of the helium is 0.9000. if the total pressure is 1,000.0 pa at 25.00 oc and the volume of the laser's cavity is 500.0 ml, what is the mass, in micrograms, of neon used in the laser?

It is a measure of the amount of matter in a substance or an object. The basic SI unit for mass is the kilogram (kg), but smaller masses may be measured in grams (g). To measure mass, you would use a balance.

How to calculate neon mass that used in the laser?
Mole fraction of neon 0.1000

Partial pressure of neon (P) = 1000 * 0.1000 = 100pa

T = it has to be in kelvin so 25 Celsius + 273 = 298K

volume = 0.5L
R = from the literature 8.314 * 10^3 J/mol.K

number of mole of neon (n)

= PV / RT

= 100*0.5L / (8.314*10^3)*298

= 50 / 2,477,572

= 2.02 * 10^-5 mol

molar mass of neon 3.351 * 10^-17 micrograms (from periodic table)

Mass of neon = mol * molar mass of neon

= 2.02*10^-5 mol * 3.351 * 10^-17

= 6.77 * 10^-22 micrograms

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