If the number of particles in a mole is 6.022x1023, what is the total mass of 1.81×1024 particles of nitrogen gas (n2)? a. 42 g b. 4.2 g c. 84 g d. 8.4 g

 the total mass  of 1.81 x10^24  particle  nitrogen  gas  is calculated as follows

find the moles of nitrogen

1 moles = 6.022 x10 ^23  particles
what about 1.81 x10^23 =? moles

= (1.81 x10^ 24)/(6.022 x10^23) = 3 moles

mass = moles x molar mass of nitrogen gas = 14 x2 = 28 g/mol

= 3  moles x28 g/mol = 84 grams