If 1.775 g of arsenic react with selenium to give 4.583 g of arsenic selenide,what is the empirical formula of the product?

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Quizplus · Accepted Answer

The mass of selenium in the compound is 4.583 g - 1.775 g = 2.808 g. The moles of arsenic are 1.775 g / 74.92 g/mol = 0.0237 mol, and the moles of selenium are 2.808 g / 78.96 g/mol = 0.0356 mol. The simplest whole number ratio of As to Se is approximately 2:3, giving the empirical formula As₂Se₃.

If 1775 G of Arsenic React with Selenium to Give 4