Skiers and group engaged in outdoor activities in a frosty climate can access Portable hot packs. Mixture of powdered iron, NaCl (sodium chloride), and other components, are present in these air-permeable paper packet and all moistened by a little water(H2O). The exothermic reaction (that produces the heat) is a very frequent one-the 4Fe(s)13O2 (g) ¡2Fe2O3(s) rusting of iron that happens at the time
When the outside plastic envelope is detached oxygen molecules that are present in the air penetrate the paper, cause the rusting of iron reaction to start. Determine how much heat is formed by this reaction if a typical packet has 250 g of Fe to warm your hands (or feet for up to 4 h) express your answer in kJ?