(a) Molecular mass of H2CO3 = 2 x 1 + 1 x 12 + 3 x 16
= 2 + 12 + 48
= 62 u
(b) Molecular mass of C2H5OH = 2 x 12 + 5 x 1 + 1 x 16 + 1
= 24 + 5 + 16 + 1
= 46 u
(c) Molecular mass of MgSO4 = 1 x 24 + 1 x 32 + 4 x 16
= 24 + 32 + 64
= 120 u
Question
Calculate the molecular mass of the following: (a) H2CO3 (b) C2H5OH (c) MgSO4
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Open Answer »A colorless liquid is thought to be a pure compound. Analysis of three samples of the material yield the following results.
| Mass of Sample | Mass of carbon | Mass of Hydrogen | |
| Sample 1 | 1.0 g | 0.862 g | 0.138 g |
| Sample 2 | 1.549 g | 1.335 g | 0.214 g |
| Sample 3 | 0.988 g | 0.852 g | 0.136 g |