find gram molecular mass of gas evolved when tin is acted upon aq. caustic soda
Find gram molecular mass of gas evolved when tin is acted upon aq. caustic soda
Answer:
When tin (Sn) reacts with aqueous caustic soda (NaOH), hydrogen gas (H₂) is evolved. The balanced chemical reaction is often represented as:
\text{Sn} + 2\,\text{NaOH} + 2\,\text{H}_2\text{O} \rightarrow \text{Na}_2[\text{Sn(OH)}_4] + \text{H}_2
The gram molecular mass (molar mass) of hydrogen gas (H₂) is calculated as follows:
- Each hydrogen (H) atom has an atomic mass of approximately 1 g/mol.
- Hydrogen gas (H₂) has two hydrogen atoms.
Thus, the molar mass of H₂ = 2 × 1 g/mol = 2 g/mol.
Below is a summary table for clarity:
| Substance | Chemical Formula | Molar Mass (g/mol) | Role in Reaction |
|---|---|---|---|
| Tin | Sn | 118.71 | Reactant |
| Sodium hydroxide (caustic soda) | NaOH | 40.00 | Reactant |
| Water | H₂O | 18.02 | Reactant (provides H for reaction) |
| Sodium stannate(II) | Na₂[Sn(OH)₄] (simplified) | - | Product (complex form) |
| Hydrogen gas | H₂ | 2 | Gas evolved (product) |
Hence, the gram molecular mass of the gas evolved is 2 g/mol. @anonymous13