Calculate vapour density of (NH₄)₂Cr₂O₇. ( N= 14, H=1, Cr= 52 , O= 16)
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Vapour density = Molecular mass /2
molecular mass of (NH4)2Cr2O7 = 18×2 +52×2+16×7
= 252
therefore vapour density = 252/2
=126
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