Chemistry and Chemical Reactivity (9th Edition)

a) $2Cr + 3Cl_{2} → 2CrCl_{3}$ b) $SiO_{2} + 2C → Si + 2CO$ c) $3Fe + 4H_{2}O → Fe_{3}O_{4} + 4H_{2}$
a) $2Cr + 3Cl_{2} → 2CrCl_{3}$ two moles of chromium reacts with three moles of chlorine to form two moles of chromium chloride. b) $SiO_{2} + 2C → Si + 2CO$ one mole of silica reacts with two moles of carbon to free the silicon and oxidize the carbon as carbon monoxide. c) $3Fe + 4H_{2}O → Fe_{3}O_{4} + 4H_{2}$ three moles of iron in pure state oxidizes with four moles of water to form one mole of ferric oxide and four moles of hydrogen.