Whats the correct answer ???

1) this is the structure in the cell nucleus that houses a cell's genetic information

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

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?