Q.Write the molecular formula and structural formula for the following molecules.

Step 1. Nitric acid, HNO3.

Molecular formula: HNO3. Structural formula: the nitrogen is trigonal planar (sp2-like), bonded to one -OH group and, by resonance, two equivalent oxygen atoms that together represent one N=O double bond and one N-O(-) single bond averaged over both positions — i.e. O=N(-OH)(-O(-)) with the two non-hydroxyl oxygens equivalent by resonance.

Step 2. Dinitrogen pentoxide, N2O5.

Molecular formula: N2O5. Structural formula: two pyramidalised NO2-type (nitrate-like) fragments, each bearing two terminal oxygens (one as N+=O-), joined together through a single central bridging oxygen atom, i.e. O2N-O-NO2.

Step 3. Phosphoric acid (orthophosphoric acid), H3PO4.

Molecular formula: H3PO4. Structural formula: a tetrahedral phosphorus atom bonded to one terminal P=O (double bond) and three -OH groups, i.e. (HO)3P=O.

Step 4. Phosphine, PH3. …

For each species, give the molecular formula, then describe the structural formula in terms of central-atom hybridisation, bond types (single/double/bridging), and overall shape, drawing on the structu …

Writing only the molecular formula without the requested structural formula/shape detail, or describing nitric acid's three oxygens as three separate ordinary single …