How many atoms are in a 385g sample of gold

Is this a single replacement reaction or there is no

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit