Will give brainliest!! :) Neon and magnesium each has three stable isotopes while sodium and aluminum each has only one. Explain why this might be so.

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.