6. Acetylene gas (C2H2) reacts with oxygen to produce carbon dioxide and water. When 30.0 g of acetylene is reacted with O2, 18.5 g of water is formed.
2 C2H2 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H20 (1)
a) What type of reaction is this?
b) What is the percent yield of this reaction?

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Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?