Hess's law can be used to calculate reaction enthalpies for hypothetical processes that can't be carried out in the laboratory. set up a hess's law cycle that will let you calculate δ h∘ for the conversion of methane to ethylene: 2ch4(g) → c2h4(g)+2h2(g) you can use the following information: 2c2h6(g)ch4(g)c2h4(g)h2o(l),+++7o2( g)2o2(g)h2(g)→→→4co2(g)co2(g)c2h6(g ),++6h2o(l),2h2o(l),δh∘=−3120.8 kjδh∘=−890.3 kjδh∘=−136.3 kjδh∘f=−285.8 kj/mol
express your answer to four significant figures and include the appropriate units.

Identify a specific example for each type of technology

Which element would mostly likely have an electron affinity measuring closest to zero

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.