Given these values ΔH°f (C2H4(g)) = 52.3 kJ/mol; ΔH°f(C2H6(g)) = –84.7 kJ/mol, calculate the standard enthalpy change of reaction, ΔH°rxn, for: 2H2(g) + 2C2H4(g)!2C2H6(g)

__can be defined as which velocity changes

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present

How have the greenhouse gasses increased from the year 2000 to 2018