What is the mass of a sample of NH3 containing 7.20 x 1024 molecules of NH3?

Which of the following pressures is equal to 760 mm hg? 2.0 atm 101.3 pa 101,300 kpa 101,300 pa

Naoki's bicycle has a mass of 10 kg. if naoki sits on her bicycle and starts pedaling with a force of 168 n, causing an acceleration of 2.8 m/s2, what is naoki's mass?

Which rate indicates the number of children that would be born per woman if she were to live to the end of her child bearing years