Igneous rocks are known as primary rock which form when magma from beneath the surface comes over the surface and solidified.
Sedimentary rock form due to deposition or accumulation of small particles, especially through sediments transported by water and wind.
Metamorphic rocks are those rocks which goes under transformation from existing rock type and this transformation takes place due to very intense pressure and heat applied over it as these are deep inside the earth's crust.
Answer: 8 moles Explanation: Nc2H6= 4 mol 2C2H6 + 7O2 → 4CO2+6H2O CO2=4/2⋅4 NCO2= 8 moles ( I write this on paper so the letters and format might be confusing) sorry!!
