Explanation:
Plaster of Paris is prepared by heating gypsum (CaSO₄·2H₂O) at 373 K, removing part of water of crystallization to form CaSO₄·½H₂O. CaCO₃ is limestone.
Explanation:
Distilled water is produced by boiling water and condensing the steam, leaving behind non-volatile impurities like salts, minerals, and most contaminants. It is almost pure H₂O. Deionized water also has salts removed. However, it may absorb CO₂ and become slightly acidic. It is used in laboratories and batteries.
Explanation:
The root mean square velocity (urms) of gas molecules can be expressed in multiple equivalent ways. It is √(3RT/M) where R is the gas constant, T is temperature, and M is molar mass. Since P = dRT/M (where d is density), it can also be written as √(3P/d). Both formulas are correct.
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