34.59 % al; 61.54 % o; 3.877 % h
% by mass = mass of element/total mass × 100 %
let's rewrite the formula of al(oh)₃ as alo₃h₃.
set up a table for easy calculation.
atom mass/u subtotal
1al 1 × 26.98 = 26.98 u
3o 3 × 16.00 = 48.00 u
3h 3 × 1.008 = 3.024 u
total = 78.004 u
mass % al = 26.98/78.004 × 100 % = 34.59 %
mass % o = 48.00/78.004 × 100 % = 61.54 %
mass % h = 3.024/78.004 × 100 % = 3.877 %
hiii, i go to lss 're taking the same class i guess. i didnt finish my test yet so i'm looking for the can u plss? (it's funny how i'm supposed to be answering the we have world cultures together too and you replied to my discussion on genetic engineering (i'm eva). so anyway i hope u reply and i want you to know that i'm also a big fan of the movies your in! byeee
im not sure on this one but i think its the last one
the answer is c because material is worn away because of weathering>