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At standardtemperatureandpressurethe number ofgaseous moleculesin the flask is.Thevolumeof the flask =3.5 LAtSTPgas occupy22.4L volume.Numberofmolesin the flask,Since,The number ofgaseous moleculesin the flask will be,Hence, we can conclude that at standardtemperatureandpressurethe number ofgaseous moleculesin the flask is.To know more aboutMole concept, refer to the link:brainly.com/question/2350371?referrer=searchRe...