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.

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.