Calcium carbide (cac2) reacts with water to form acetylene (c2h2) and ca(oh)2.
from the following enthalpy of reaction data and data in appendix c, calculate δh∘f for cac2(s):
cac2(s)+2h2o(l)→ca(oh)2(s)+c2h2(g)δ h∘=−127.2kj
δh∘f = kj?

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."