Aballoon contains 12.88 g of nnitrogene gas (n2). how many nitrogene molecules are in the balloon?

How has the scientific community addressed the safety of chemicals? a. chemicals are repeatedly tested, even those that have existed for a long time. b. existing chemicals are tested if they have never been tested before. c. chemicals are tested if they are suspected to have caused a problem. d. only new chemicals are tested.

What is important to study for nios grade 12 chemistry? i have only one month left.

What is true for a substance that releases energy