2c2h6+7o2 = 4co2+6h2o What is the molar ratio would you use if you have 2.9 mol O2 and you wanted to know how many moles of CO2 it would make?

Is it:
A = (2 mol C2H6) / (7 mol O2)

B = (7 mol O2 )/ (4 mol CO2)

C = (4 mol CO2) / (7 mol O2)

D = (1 mol CO2) / (2.9 mol O2)

What material does not melt at any temperature

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory

In chemistry, the type of an atom (what element it is) is determined by: a) the number of protons it contains in its nucleus.b) the number of neutrons it contains in its nucleus.c) the number of protons it has in a cloud around the nucleus.d) the number of neutrons it has in a cloud around the nucleus.e) the number of electrons it exchanges with its neighbors.