What do scientists hypothesis causes mass extinction? A. rising ocean levels
B. huge clouds of dust
C. major climate changes
D. violent earthquakes

Which element would mostly likely have an electron affinity measuring closest to zero

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.

Ab c or d ? i’m not sure what the answer is