A mixture of 25 liters of hydrogen and 20 liters of chlorine was ignited. Determine the amount of hydrogen chloride formed.

H2 + Сl2 -> 2HCI
According to the reaction, we see that chlorine and hydrogen react in a ratio of 1: 1 This means that from a mixture of 25 liters of hydrogen and 20 liters of chlorine, 20 liters of hydrogen and chlorine reacts, and 5 liters of hydrogen remains, according to the law of volumetric ratios.
According to the equation, we also see that 2 times more hydrogen chloride is formed than each gas reacts. So hydrogen chloride is formed 20l * 2 = 40l.

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