A Question about Chemistry

Question

Calculate each of the following

 

(a) moles of compound in 0.510 g ammonium bromide
_____ mol

(b) number of potassium ions in 59.8 g potassium nitrate
_____ ions

(c) mass in grams of 6.02 mol glycerol (C3H8O3)
_____. g

(d) volume of 1.35 mol of chloroform (CHCl3; d=1.48 g/mL)
_____ mL

(e) number of sodium ions in 2.20 mol sodium carbonate
_____ ions

Answer 1

what is the chemical formula for ammonium bromide? from the combined atomic weights you have the molar weight...then you divide the quantity 0.51g by the combined atomic weight of the molecule and bam...number of moles