The 4.000g sample of M2S3 is converted to MO2 and loses 0.277g.what is the atomic weight of M?

Answer 1

M = atomic mass M
O = atomic mass O
S = atomic mass S
MO2 = molar mass MO2
M2S3 = molar mass M2S3
----------------------
M2S3 + 5O2 ==> 2MO2 + 3SO2
4.00.........4.00-0.277 = 3.72

4.00 x (2*MO2/M2S3) = 3.72
4.00 x (2*M+4*amO/2*M + 3*S)
4.00 x (2*M + 64) = 3.72(2*M + 3*96)
Solve for M.
You may want to put in a more accurate number for atomic mass S. Post your work if you get stuck.

Answer 2

Am stuck