Which of the following vary for isotopes of atoms of the same element? A. Atomic number
B. Atomic mass
C. Number of electrons
D. Number of protons

What reaction is taking place? 02 + c3h8 = h20 + co2

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

Read the chemical equation. 2c2h2 + 5o2 → 4co2 + 2h2o which of the following statements would be correct if one mole of c2h2 was used in this reaction? one mole of oxygen was used in this reaction. five moles of oxygen were used in this reaction. four moles of carbon dioxide were produced from this reaction. two moles of carbon dioxide were produced from this reaction.