State the trend, at standard pressure, of the boiling points of these noble gases, as they are considered in order of increasing atomic number.

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.

Draw the lewis dot structure for each of the following polyatomic ions

What is the mass of 0.750 mole of aluminum oxide, al2o3?