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.

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates