Can someone plz me with questions 4 through 7 plz this is for masteries

What is the empirical formula of a compound that is 50.7% antimony and 49.3% selenium ?

Me soon im confused much mass would a mole of hydrogen molecules contain? recall that hydrogen is diatomic. g/mol

How does water evaporating from a glass show that matter is made up of particles? a. the heat energy from the air causes the glass to fill up with water particles. b. the liquid water particles turn into water vapor that spreads in the air. c. the particles of the glass dissolve in water and cause it to evaporate. d. the tiny particles of the glass evaporate and seem to disappear.