1. The problem statement, all variables and given/known data At 1500 ° C , CO is formed more than at 1000 ° C. Is the reaction from left to right exothermic or endothermic? 2. Relevant equations C(s) + H2O ↔CO(g) + H2 3. The attempt at a solution I think its Exothermic reaction . The temperature is increased from 1000°C to 1500 °C . If heat increases the CO + H2 (products) shall produced more. Heat is a product in a exothermic reaction .So C(s) + H2 ↔CO(g) + H2 +x KJ But correct answer seems to be endothermic. I don't know why?