Question

calculate the number of molecule in 80 g of NaoH (the molecular mass of NaoH is 40 g)​

Answer 1

Explanation:

No of moles = given mass / molar mass

= 80 / 40= 2 mol .

Again no of atoms 2 × 6.022× 10 ^ 23= 12.044

Answer 2

Answer:

$\frac{number \: of \: molecules \: }{avogadro \: number} \: is \: equal \: to \: \frac{given \: mass \: \: }{molecular \: mass} \\ \frac{n}{ {6.022×10}^{23} } \: equals \: \frac{80}{40} \\ n \: equals \: \frac{ {6.022×10}^{23} \times 80 }{40} \\ {12.044×10}^{23} \ molecules$

Hope this helps!!!!!