Final answer:
Without the specific solubility data for NH₄ClO₄ at 30°C, an accurate calculation cannot be provided. Solubility calculations usually require the solubility product or specific solubility data for the compound in question.
Step-by-step explanation:
The student's question involves calculating the solubility of NH₄ClO₄ (ammonium perchlorate) at a certain temperature, but the provided information relates to NH₄Cl (ammonium chloride), which is a different compound. Therefore, without specific solubility data for NH₄ClO₄ at 30°C, we cannot provide an accurate answer for the solubility of NH₄ClO₄ in 250 mL of water at that temperature. Typically, solubility data is available in the literature and would be used to calculate the amount of NH₄ClO₄ that would dissolve in a given volume of water at a certain temperature.
To calculate solubility, generally, the solubility product or solubility data is required, which gives the maximum amount of solute that can dissolve in a solvent at a specific temperature.