What is the percent yield of CO2 if 46.5 grams of CO2 is recovered from the reaction of 21.5 grams of C2H2 according to the reaction below?
2 C2H2 + 5 O2 —> 4 CO2 + 2 H2O

1. list three scientific reasons cockroaches may fly.

If i add water to oil what will happen

Suppose you discovered a new element with 120 protons and 2 electrons in its outer level . i'm what group does this new element belong? what properties would you expect it to have