F5 chem molar volume help plz－貨運百科

標題:

F5 chem molar volume help plz

發問:

Which of the following gases has the greatest number of atoms under r.t.p.? A.18 dm3 of ammonia B.32 dm3 of helium C.6.0 dm3 of methane D.8.0 dm3 of sulphur trioxide steps plz

最佳解答:

Theanswer is : A. 18 dm3 ofammonia A. Number of moles of NH3 molecules = 18/24 = 0.75 mol Each NH3 molecule contains 4 atoms (1 N atom and 3 H atoms). Number of moles of atoms = 0.75 x 4 = 3 mol B. Number of moles of He atom = 32/24 = 1.33 mol C. Number of moles of CH4 molecules = 6/24 = 0.25 mol Each CH4 molecule contains 5 atoms (1 C atom and 4 H atoms). Number of moles of atoms = 0.25 x 5 = 1.25 mol D. Number of moles of SO3 molecules = 8/24 = 1/3 mol Each SO3 molecule contains 4 atoms (1 S atom and 3 O atoms). Number of moles of atoms = (1/3) x 4 = 1.33 mol Obviously, A has the greatest number of atoms.