Red phosphorus reacts with liquid bromine in an exothermic reaction: 2 P(s) + 3 Br₂(l) ► 2PBr₃(g)
ΔH° = -243.0 kJ
Calculate the enthalpy change when 2.63 g of red phosphorus reacts with 25.0 g of Br₂.

How does the viscosity of magma change as magma cools?

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.

Which proportionality applies to avogadro’s law?