Directions: Write the condensed structural formula of the following. You may refer to the tables on the next pages as your additional references.

What happens to energy in an open system?

What is the mass of sodium in 3 moles of sodium chloride

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.