How many moles is 2.04x1023 molecules of NH3?

We will Multiply the number of moles with Avagadro's number

So it will be (2.04×1023)×6.022×10^23

NA means Avagadro's number

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.