Question

1. Which sample contains a total of 9.0 * 10 ^ 23 atoms ? A) 0.50 mole of HCI B) 0.75 mole of H 2 O C) 1.5 moles of Cu D) 1.5 moles of H 2

Answer 1

c. 1.5 moles of Cu will contain a total of 9.0 * 10 ^ 23 atoms.

Explanation:

To convert moles into atoms,  the molar amount and number of atom is multiplied by Avagadro's number.

Avagadro's number is 6.022×$10^{23}$  

So applying the formula in the given sample:

A) 0.5×6.022×$10^{23}$

   3.01×$10^{23}$ atoms.

B) 0.75 mole of H20

O.75×6.022×$10^{23}$

= 4.5166×$10^{23}$  atoms.

C) 1.5 moles of Cu

  1.5×6.022×$10^{23}$

  =  9.033×$10^{23}$

D). 1.5 moles of H2

1.5 × 2 × 6.022 × $10^{23}$

= 18.066 × $10^{23}$ atoms   because H2 is 2 moles of hydrogen.

Atom is the smallest entity of matter having property of the element to which it is a part.