Question

6) How many molecules are there in 122 grams of NO2?

Answer 1

• Given mass of
  `\bf NO_2` is 122g and we are asked to find number of moles present in 122g of
  `\bf NO_2`

`\qquad`
`\pink{\bf\longrightarrow { Molar \:mass \:of \: NO_2:-} }`

`\qquad`
`\bf \twoheadrightarrow 14 + 16 * 2`

`\qquad`
`\bf \twoheadrightarrow 46`

`\qquad`____________________

Calculating the number of moles present in 122g of
`\bf NO_2`

`\qquad`
`\pink{\sf\longrightarrow { No \:of \:moles = (Given \:mass)/(Molar\: mass)}}`

`\qquad`
`\bf \twoheadrightarrow (122)/(46)`

`\qquad`
`\bf \twoheadrightarrow \cancel{(122)/(46)}`

`\qquad`
`\bf \twoheadrightarrow 2.65\: moles`

__________________________________