Calcualte the mass (in grams) of each of the following species.
a. Na atom b. S atom c. `CH_3Cl` molecule d. `Na_2 SO_3` formula unit

Calculate the formula weight of each of the following to three significant figures, using a table of atomic weight (AW): (a) chloroform CHCl_3 (b) Iron (III) sulfate , Fe_2(SO_4)_3 .

Write Lewis dot symbols for atoms of the following elements: Mg, Na, B, O, N, Br.

In a traction x+y + z_(2)to xyz_(2) , Identity the limiting reagent If tiny, in the following traction mixtures. (a) (A) 200 atoms of x+ 200 atoms of y+ 50 molecules of z_(2) (b) 1 mol of x+1 mol of y +3 3 mol of z_(2) (c) 50 atoms of x + 25 atoms of y + 50 molecules of z_(2) (d) 2.5 mol of x + 5 mol of y + 5 mol of z_(2)

How many grams are there in the following ? 3 moles of chlorine molecule , Cl_2