Question

Question #97c8f

Answer 1

I think answer is 78 gm

Explanation:

% sum of all the elements = 100
% of H = 7.7
% left of remaining elements = 100-7.7 = 92.3%

now we find the % of other elements with help of ratio given

% of C = `3*92.3/9` = 30.77%
% of O = `2*92.3/9` = 20.51%
% of S = `4*92.3/9` = 41.02%

now to finding empirical formula, we divide % by the atomic masses of respective element

C `30.77/12` = 2.56
O `20.51/16` = 1.28
S `41.02/32` = 1.28
H `7.7/1` = 7.7
now we divide all these %-mass ratio by the smallest %-mass ratio i.e. 1.28

C `2.56/1.28` = 2
S `1.28/1.28` = 1
O `1.28/1.28` = 1
H `7.7/1.28` =approx. 6

so the empirical formula is `C_2OSH_6` and mass is 24 + 16 + 32 + 6 = 78 gm