Molecular mass and mole concept — task. Science CBSE Homework Assignments, Class 9.

Calculate the number of atoms.

(Enter your answer with two decimal places, where necessary)

Note:

the Avogadro number is

6.022 \times 10^{23}

the molar mass of \(Na\): \(23\) u

the molar mass of Nitrogen: \(14\) u

i). 42 g of \(Na\) atoms (number from mass)

The number of atoms in 42 g of Na \(=\)

i \times 10^{23}

ii). 69 g of Nitrogen atoms (number from mass)

The number of atoms in 69 g of Nitrogen \(=\)

i \times 10^{23}

Did you find an error?

1. Molecular mass and mole concept