What is number is moles in 15 grams of nitrogen

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

A50.0 ml sample of gas at 20.0 atm of pressure is compressed to 40.0 atm of pressure at constant temperature. what is the new volume? 0.0100 ml 0.325 ml 25.0 ml 100. ml