A compound includes only Phosphorous and Sulpur.There are 1.24 grams of Phosphorous in 2.20 grams of the compound.What is the molecular formula of the compound?
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Expert's answer
2014-03-21T10:41:08-0400
Calculate the mass of sulfur in the compound: m(S) = m(compound) - m(P) = 0.96 g To find the molecular formula we should obtain the molar ratio between Sulfur and Phosphorus. Find the amount of moles of Sulfur and Phosphorus in the compound: n(S) = m/M = 0.96/32 = 0.03 n(P) = m/M = 1.24/31 = 0.04 n(S) : n(P) = 0.03 : 0.04 = 3 : 4 Hence the molecular formula of the compound is P4S3.
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