Question

how many molecules are there in 122 grams of NO2

Answer 1

Solution:

Given,

Given mass of NO2 = 122 g

Atomic mass of N = 14 g

Atomic mass of O = 16 g

Molecular mass of NO2 = 46 g

Number of molecules = 122 × 1/ 46 × 6.022 × 10^(23)

Number of molecules = 1.47 × 10^(23) molecules.

Thus, there are 1.47 × 10^(23) molecules present in 122 grams of NO2.

Answer 2

Hi there,

● Number of moles is the result of dividing the sample mass over the molar mass

n = ms ÷ Mwt

n= 122 ÷ 46 = 2.65 mol

● The number of molecules is equal the moles time avogadro's no

Nu = n × NA

Nu = 2.65 × 6.02×10^23

= 1.6×10^24 molecule

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