5. How many atoms are in a 591 g sample of gold? 3.60 x 1025 atoms
O
1.81 x 1024 atoms
116,000 atoms
o
3.00 atoms

You use the fact that 1 mole of any substance contains exactly 6.022⋅1023 atoms or molecules of that substance - this is known as Avogadro's number. In your case, 1 mole of gold will have exactly 6.022⋅1023 atoms of gold.

So it would be answer 3690 atoms or 3.60x1025

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.