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

The sample that contains 9.0 x atoms would be 1.5 moles of Cu.

1 mole of a substance contains 6.0 x   atoms of the same substance. Thus:

Hence, the only sample that contains  9.0 x   atoms is 1.5 mole of Cu.

More on number of atoms of substances can be found here: link?

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×  

So applying the formula in the given sample:

A) 0.5×6.022×

   3.01× atoms.

B) 0.75 mole of H20

O.75×6.022×

= 4.5166×  atoms.

C) 1.5 moles of Cu

  1.5×6.022×

  =  9.033×

D). 1.5 moles of H2

1.5 × 2 × 6.022 ×

= 18.066 × 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.

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