Calculate the percent nitrogen in these common fertilizers. a. NH₂ b. NH₄NO₃ Please show all calculations

When you mate two plants together the terms is called? answer it fast as possible plz! i have a test tomorrow!

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

A5 mole sample of liquid acetone is converted to a gas at 75.0°c. if 628 j are required to raise the temperature of the liquid to the boiling point, 15.600 kj are required to evaporate the liquid, and 712 j are required to raise the final temperature to 75.0°c, what is the total energy required for the conversion?