This opaque mineral shows a dull, or dully-metallic luster and is typically black or brown-black in color, typically shows no strong cleavage, has a hardness of 5.5 - 6.5 and produces a black streak, has a specific gravity of 5.2, may react weakly with HCl, is strongly magnetic and will attract iron filings. What is this mineral

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

we need the questions , i may then you.

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .