kaitlyn114433
13.12.2019 •
Chemistry
Which of the following is not a pure substance
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Ответ:
Ответ:
B) 10.5
Explanation:
PV= NRT -> N=PV/RT
N= mols . P= pressure . V= volume in Liters T= temp in Kelvin (Celsius degree = 273.15) . R= Gas constant (.0821 for atm)
N=(.77 x 65.5)/(.0821x235) = 2.614 mols of Helium
Mols x Molecular weight = weight in grams
2.614x4.003(Molecular weight ot He) = 10.46 round to 10.5