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Exam (elaborations)

A sample of a gas weighs 2. 964 g and has a volume of 910. 0 mL at 76

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A sample of a gas weighs 2. 964 g and has a volume of 910. 0 mL at 765. 0 torr and 27. 0 degree C. What is its molar mass? Number g/ mol Solution PV = nRT n = mass / mw substitute and rearrange... PV = (mass /mw) RT mw = mass RT / (PV) mw = (2.964g) x (0.08206 Latm/moleK) x (300K) / ((765mmHg x 1atm/760mmHg) x (0.910L)) mw = 79.66 g/mole

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A sample of a gas weighs 2. 964 g and has a volume of 910. 0 mL at 765. 0 torr and 27. 0 degree
C. What is its molar mass? Number g/ mol


Solution
PV = nRT n = mass / mw substitute and rearrange... PV = (mass /mw) RT mw =
mass RT / (PV) mw = (2.964g) x (0.08206 Latm/moleK) x (300K) / ((765mmHg x
1atm/760mmHg) x (0.910L)) mw = 79.66 g/mole
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  • sample gas
  • gas weighs
  • weighs 2
  • 2 964
  • 964 g
  • g has
  • has volume
  • volume 910
  • 910 0
  • 0 ml
  • ml 76
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