Can someone please answer this question for me?
Thanks ;)

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

In this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced?

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?