Please help 1) only

Someone, part 1: which compound does c represent? part 2: name a process that could release this compound into the air. part 3: explain how the elements that form it are conserved during the carbon cycle. use complete sentences to explain your answer. justify how this compound was created from a recycling of carbon in the carbon cycle. use complete sentences to explain your answer.

How many grams of n2h4 will be consumed by 23 g of n2o4

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density