Which of these is a coefficent in this chemical equation? 3mg+n2 = mg3n2

What is the composition, in atom percent, of an alloy that consists of 4.5 wt% pb and 95.5 wt% sn? the atomic weights for pb and sn are 207.19 g/mol and 118.71 g/mol, respectively.(a) 2.6 at% pb and 97.4 at% sn(b) 7.6 at% pb and 92.4 at% sn(c)97.4 at% pb and 2.6 at% sn(d) 92.4 at% pb and 7.6 at% sn

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

If two identical atoms are bonded,what kind of molecule is formed