How many moles of NH3 are in 4.20 x 1024 molecules of it?

              6.97 moles

Explanation:

Formula Used,

Moles = No. of Molecules ÷ 6.022 × 10²³

Putting Values,

Moles = 4.20 × 10²⁴ ÷ 6.022 × 10²³

Moles = 6.97 moles

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.