According to Avogadro's hypothesis, one volume of hydrogen reacts with one volume of bromine to give two volumes of hydrogen bromide.

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Avogadro's hypothesis states that equal volumes of gases at the same temperature and pressure contain equal numbers of particles. Therefore, when one volume of hydrogen gas (H2) reacts with one volume of bromine gas (Br2), they will combine to form two volumes of hydrogen bromide gas (HBr). This is because each molecule of HBr consists of one H atom and one Br atom, so two HBr molecules are formed for every H2 and Br2 molecule that react.

According to Avogadro's Hypothesis, One Volume of Hydrogen Reacts with One