Q. 145.0( 3 Votes )

Calculate the mass of 3.011 × 1023 atoms of nitrogen.

Answer :

First we will convert 3.011 × 1023 number of nitrogen atoms into number of moles:

We know, 1 mole = 6.022 × 1023(Na = Avogadro’s number)




Number of moles = 0.5


Now, to calculate mass, apply the formula:




We can write:


Mass(m) = Number of moles (n) × Molar mass of nitrogen (M)


Mass = 0.5 mol × 14g/mol


Mass = 7g


Thus, the mass of 3.011 × 1023 atoms of nitrogen is 7g


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