Sentence Correction (SC) | When chemist Amedeo Avogadro (1776 – 1856) posited that

When chemist Amedeo Avogadro (1776 – 1856) posited that equal volumes of different gases, at the same temperature and pressure, containing equal numbers of molecules, and many scientists, doubting that, even if this theory were true, the number could ever be measured, but in the early 20th century, Perrin measured the value of "Avogadro's number" by useof[/u] several different experimental designs.

A. When chemist Amedeo Avogadro (1776 – 1856) posited that equal volumes of different
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