What is it called when it erupts onto Earth's surface?

Evaluate this exponential expression,8. (2 + 3)2 – 42

What is the percentage of hydrogen in nitrogen trihydride

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.