Calculate the percentage by mass of oxygen in the followingcompounds. (a) CH 3 C

Question

Calculate the percentage by mass of oxygen in the followingcompounds. (a) CH3COOCH3   _____% (b) Cr(NO3)3   _____% (c) CH3CH2COOCH3  _____% (d) SO3     _____% (e) ammonium nitrate   _____% Calculate the percentage by mass of oxygen in the followingcompounds. (a) CH3COOCH3   _____% (b) Cr(NO3)3   _____% (c) CH3CH2COOCH3  _____% (d) SO3     _____% (e) ammonium nitrate   _____% (e) ammonium nitrate   _____%

Explanation / Answer

a) MW = 12*3 + 6*1 + 2*16 = 74 % O = 2*16/74 => 43.2 % b)   3*3*16 / [3*14 + 9*16 + 1*52] => 60.5% c) 2*16/ [12*4 + 1*8 + 2*16] = 36.5% d) 3*16/ [ 32.1 + 3*16] = 59.9% e) NH4NO3 3*16 / [14*2 + 3*16 + 4*1] = 60.0%

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