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Hydrogen is a gas, sulfur is a solid, oxygen is a gas, why does combining them to produce sulfuric acid produce a liquid?
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Wrong for sulphuric acid.Actually, when you combine these they produce a gas. When you combine the gas with water you get what is commonly known as sulfuric acid. Same goes for hydrochloric acid.
Wrong for SO3. The reaction to produce SO3 occurs at hundreds of degrees C over catalysts and produces a gas at that temperature.Wrong for sulphuric acid.
At 1 bar partial pressure, SO2 is indeed a gas - condenses at -10 Celsius.
However, SO3 is NOT a gas at 1 bar and 20 Celsius. It easily condenses to a liquid, boiling point +45 Celsius, and less easily to a solid that sublimes at IIRC 62 Celsius.
Note that reaction of hydrogen - a gas, condenses at -253 Celsius - and oxygen - a gas, condenses at -183 Celsius - gives water - a liquid, condenses at +100 Celsius.