Answer:could it be kilo
Explanation:it looks like it has the least letters
You know if it's endothermic or exothermic by doing the enthalpy reaction. If the change of temperature is negative then it is exothermic, while positive is endothermic.
If you get -22K then its exothermic, but if you get +22 its endothermic.
They use experimental investigations where they manipulate variables
2:7 ratio of ethane to O2 = 15:x 9solve for x)
x=52.5 mol O2