Find ΔHrxn for the reaction: 3 H2(g) + O3(g)S3 H2O(g) Use these reactions with knownΔ H ’s: 2 H2(g) + O2(g)h2 H2O(g) ΔH = -483.6 kJ 3 O2(g)h2 O3(g) ΔH = +285.4 kJ 6.9

Which of the following pressures is equal to 760 mm hg? 2.0 atm 101.3 pa 101,300 kpa 101,300 pa

Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms