Which of the following reactions is endothermic?

h2(g) + ½ o2(g)h2o(g),h = -57.82 kcal
½n2(g) + o2(g) + 8.1 kcalno2(g)
½ n2(g) + 3/2 h2(g)nh3(g) + 11.0 kcal
c(diamond)+ o2(g)co2,h = -94.50 kcal

Surface currents are caused by blank space . question 14 options: surface currents are caused by? differences in water temperature high salinity differences in density wind forces

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.

What is the percentage of hydrogen in c2h4