A chemical manufacturing company prepares different covalent compounds for industrial and laboratory use. Before packaging, the quality control (QC) team verifies the molecular mass of each compound to ensure that the correct chemical has been synthesized.
The QC team records the following compounds for verification.
Atomic Masses: \(H = 1\ u, C = 12\ u, N = 14\ u, O = 16\ u, S = 32\ u, P = 31\ u, Cl = 35.5\ u, Br = 79\ u\)
| Compound | Molecular Formula |
| A | \(H_{2}S\) |
| B | \(CS_{2}\) |
| C | \(NO_{2}\) |
| D | \(PCl_{5}\) |
Study the information carefully and answer the given questions.
1. Calculate the molecular mass of Compound A \((H_{2}S)\). -
2. Arrange the compounds in increasing order of molecular mass. -
3. A student calculated the molecular mass of \(NO_{2}\) as \(30\ u\). Which mistake was most likely made? -
4. Which conclusion is best supported by the information in the case study? -