13. what is the precent composition
of Ca (C2 H3 O2) 2

Ca C2h3o2 2

Explanation

find the molar mass of the compound

ca : 1 X 40.1 = 40.1

c: 4 x 12.01 = 48.04

H: 6 X 1.01 = 6.06

O: 4 X 16 = 64

add these up and get 158.11

then divide 158.11 by each element massand multiply by 100

Ca: 40.01/158.11 X 100 = 25.3%

C: 30.4%

H:3.8%

O: 40.5%

b) mutualism

hope this : )

"the periodic table is arranged in order of atomic number."