• The hard part in this problem is balancing the equation, which it seems you have already done. Just convert the grams of acetylene into moles. You can even do it online, by googling "convert 140 g acetylene to moles." Then, do the reverse for carbon dioxide and water. It's so easy, you should be able to do this in your head. The atomic masses of carbon, hydrogen, and oxygen are easy to remember, in round numbers (12, 1, and 16). So, for example, H2O is about 14, and CO2 is about 44.
    • Nicole Osborne
      Thanks and all, I know how to convert. But your answer didn’t really help.

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