Do Do the following conversions. a) 350 torr to kPa b) 0.525 atm to mm Hg c) 0.5

Question

Do Do the following conversions. a) 350 torr to kPa b) 0.525 atm to mm Hg c) 0.525 mm Hg to Pa d) 1453 cal to kJ (II) Which sample contains more molecules A or B?: 2.5L of air at 50degreeC and 740 mm Hg pressure (A) or 2.5 L of CO_2 at -15 degreeC and 765 mm Hg pressure (B) ? Show your calculations to answer this question. (III) Methane has a volume of 22.4 L at STP. What is the density of methane in g/L at STP? (IV) The following reaction has DeltaHdegree = -484 kJ. 2H_2 (g) + O_2 (g) rightarrow 2H_2O (g) a) How much work in Joule (J) is for the reaction of 0.5 mol of hydrogen and 0.25 mol of oxygen at atmospheric pressure (1.00 atm) if the volume change is - 5.6L?

Explanation / Answer

i) 350 torr = 46.66 kPa

   0.525 atm = 398.9 mm of Hg

   0.525 mm Hg = 69.994253 Pa

   1453 cal = 6079.352 kJ

iii) density(d) = mass(m)/volume(V)

    so volume =22.4 L

    d= 16.031300128 gr / 22.4 L

    d= 0.7156830414 gr/L

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