Use the molar bond enthalpy data in the table to estimate the value of Δ H rxn ΔHrxn for the equation C 2 H 4 ( g ) + HBr ( g ) ⟶ C 2 H 5 Br ( g ) C2H4(g)+HBr(g)⟶C2H5Br(g) The bonding in the molecules is shown here.

Calcium hydride (cah2) reacts with water to form hydrogen gas: cah2(s) + 2h2o(l) → ca(oh)2(aq) + 2h2(g) how many grams of cah2 are needed to generate 45.0 l of h2 gas at a pressure of 0.995 atm and a temperature of 32 °c?

How much heat is released upon converting one mole of steam (18.0 g) from 100.0 ∘c to water at 25.0 ∘c? show work and constants, trying to figure out how it works. only given the heat capacity for steam and water so try to only use that

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.