“how many moles of h2o are produced when 64.0 g c2h2 burn in oxygen?

I think the answer should be 44 mol H2O
64.0g C2H2 * 1 mol/26g C2H2*18 mol H2O/1 mol

Idkat all because idhducheh

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.