What is the charge of an oxygen ion? -

There are 6.022 x 10^23 atoms of hg in 1 mole of hg. the number of atoms in 4.5 moles of hg can be found by multiplying 4.5 by 6.022 x 10^23 a. 2.7 x 10^24 b. 27 x 10^23 c. 2.71 x10^24 d. 27.099 x 10^23

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?