What is the percent h in ca(c2h3o2)2

3.824 %

Explanation:

Let’s rewrite the formula as CaC₄H₆O₄ and calculate the mass of each component,

Element  Atomic mass/u No. of atoms  Subtotal mass/u

     Ca               40.08                  1                     40.08

     C                 12.01                    4                    48.04

     H                   1.008                6                       6.048

     O                16.00                   4                     64.00

                                                    Total mass = 158.17

The formula for mass percent is

% by mass = mass of component/motal mass × 100 %, or

% H = mass of H/mass of Ca(C₂H₃O₂)₂ × 100 %

Mass of H = 6.048 u

Mass of Ca(C₂H₃O₂)₂= 158.17 u

% H = 6.048/158.17 × 100

% H = 0.038 24 × 100

% H = 3.824 %

these nuts

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)