How many molecules are in 35.5 grams of carbon dioxide?

you have to use the avogadro's constant of 6.023×10^23 to calculate the number of molecules of carbon dioxide.and you also have to use the molecular mass which is 44.

35.5/44×6.023×10^23

=4.85×10^23

I hope this helps and sorry if it's wrong

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.