Question

mass of nitrogen present in 4.6 g of no2 is (atomic mass of n= 14 u and o=16 u is a) 2.8gm b) 2.2g c) 1.8g d) 1.4g​

Answer 1

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Answer 2

Given:

Given mass of NO₂ is 4.6g

To find:

Mass of nitrogen present in 4.6g of NO₂

Solution:

Molecular mass of NO₂ = Atomic mass of N + (2×Atomic mass of O)

                                       = 14+(2×16) = 46u

Firstly we have to find the number of moles,

Number of moles = given mass/molecular mass

here, given mass is 4.6g

         molecular mass is 46u

so, no. of moles = 4.6/46

                           = 0.1moles

now, Mass of nitrogen in 1 mole of NO₂ is = 14g

        Mass of nitrogen in 0.1 mole of NO₂ is = 0.1×14g

                                                                         = 1.4g

The mass of nitrogen present in 4.6g of NO₂ is 1.4g.

So, Option (d) is correct.