Question

# Determine the molecular mass and its uncertainty for C6H5OH . Significant figures are graded for this...

Determine the molecular mass and its uncertainty for C6H5OH . Significant figures are graded for this problem. To avoid errors, do not round your answers until the very end of your calculations and use the atomic masses given in the table.

Element Atomic Mass
H 1.00794 ± 0.00007
C 12.0107 ± 0.0008
O 15.9994 ± 0.0003

Given compound = C6H5OH

Molecular mass of H = 1.00794 ± 0.00007

Molecular mass of C = 12.0107 ± 0.0008

Molecular mass of O = 15.9994 ± 0.0003

Molecular mass of C6H5OH

= 6*Molecular mass of C + (5+1)*Molecular mass of H + 1*Molecular mass of O

= 6*(12.0107 ± 0.0008) + (5+1)*(1.00794 ± 0.00007) + 1*(15.9994 ± 0.0003)

= (72.0642 ± 0.0048) + (6.04764 ± 0.00042) + (15.9994 ± 0.0003)

= 94.11124 ± 0.00552

= 94.1112 ± 0.005

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