Question

number of moles of O atom in 126 amu of HNO3

Answer 1

Answer:

Here we have 126 AMU of HNO3,

Molar mass of HNO3 is 1+14+16x3 = 63amu

Number of molecules of HNO3 are = 126/63 = 2

Here we have 2 molecules

Each molecule have 3 atoms of oxygen.

So no. of oxygen atoms= 3x2 =6 atoms

No. Of moles = given particles/ avogadro number

No. of moles of oxygen = 6 / 6.022 x 10^23

No. of moles =9.96 x 10 ^-22

Explanation: