Glycine, c2h5o2n, is important for biological energy. the combustion reaction of glycine is described by the following thermochemical equation. 4c2h5o2n(s) + 9o2(g) → 8co2(g) + 10h2o(l) + 2n2(g) δh°rxn = –3896 kj/molwhat is the standard enthalpy of formation of solid glycine? –51.90 kj/mol–527.5 kj/mol–974.0 kj/mol–1502 kj/mol–2476 kj/mol

Which position represents spring in the southern hemisphere? a) b) c) d)

What determines the average kinetic energy of the particles in a gas? a. the number of collisions b. the number of particles c. the size of the particles d. the temperature

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.