1. Calc.: Gram Formula Mass
(NH4)2SO3
LIST SUBSCRIPTS N 2 H 8 S 1 O 3
LIST
ELEMENTS
HERE

2. Calc.: Gram Formula Mass
LIST SUBSCRIPTS
MULTIPLY
By atomic mass
INSERT ATOMIC MASS
FROM PERIODIC TABLE N 2 X
14.01 g = H 8
1.01 g = S 1
32.06 g = O 3
16.00 g =
LIST
ELEMENTS
HERE

3. Calc.: Gram Formula Mass
LIST SUBSCRIPTS
MULTIPLY
By atomic mass
INSERT ATOMIC MASS
FROM PERIODIC TABLE N 2 X
14.01 g =
28.02 g H 8
1.01 g =
8.08 g S 1
32.06 g =
32.06 g O 3
16.00 g =
48.00 g
LIST
ELEMENTS
HERE g
Add SUBTOTALS

4. Calculation Of Percent Composition (Mass) (NH4)2SO3X
14.01 g =
28.02 g H 8
1.01 g =
8.08 g S 1
32.06 g =
32.06 g O 3
16.00 g =
48.00 g
%N=
28.02 g g
x100
%N= x 100 g
%Mass=
Mass of part
Mass of whole
x100
%N= %

5. Calculation Of Percent Composition (Mass) (NH4)2SO3X
14.01 g =
28.02 g H 8
1.01 g =
8.08 g S 1
32.06 g =
32.06 g O 3
16.00 g =
48.00 g
%H =
8.08 g g
x100
%H =
6.06 g
114.14
x100
%H = x 100 g
%H = 6.96%
%Mass=
Mass of part
Mass of whole
x100

6. Calculation Of Percent Composition (Mass) (NH4)2SO3X
14.01 g =
28.02 g H 8
1.01 g =
8.08 g S 1
32.06 g =
32.06 g O 3
16.00 g =
48.00 g
%S =
32.06 g g
x100
%S = x 100 g
%S = 27.61%
%Mass=
Mass of part
Mass of whole
x100

7. Calculation Of Percent Composition (Mass) (NH4)2SO3X
14.01 g =
28.02 g H 8
1.01 g =
8.08 g S 1
32.06 g =
32.06 g O 3
16.00 g =
48.00 g
%O =
48.00 g g
x100
%O = x 100 g
%O = 41.33%
%Mass=
Mass of part
Mass of whole
x100

8. Calculation Of Percent Composition (Mass) (NH4)2SO3X
14.01 g =
28.02 g H 8
1.01 g =
8.08 g S 1
32.06 g =
32.06 g O 3
16.00 g =
48.00 g
%N= 24.13%
%H = 6.96%
%S = 27.61% g
%O=
48.00 g g
x100
%O= (%N + %H + %S)
%O=100-( )
%O= 41.33% OR
24.13
6.96
27.61
%O= 41.33%