calculate the energy required to produce 90.19 g of Br2

Question

Given the thermochemical equation:

2 𝐻𝐵𝑟(𝑔)→H2(𝑔) + Br2(𝑙) ∆𝐻 = +72.4 kJ/mol

calculate the energy required to produce 90.19 g of Br2

Answer 1

2 𝐻𝐵𝑟(𝑔) ==> H₂(𝑔) + Br₂(𝑙) ... ∆𝐻 = +72.4 kJ/mol

90.19 g Br2 x 1 mol Br2 / 159.8g x 72.4 kJ / mol = 40.9 kJ