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checkout.nal uw oshkosh-v. x : G search Textboo × a (14,964 ity of Massachusetts Amherst (USI https/etest.cesd.umass.edu/owlj/servlet/Student : Final Exam out × Devan Scheuers- ROnline General Chemistry Practice Exam Time Left: 81 minutes Periodic Table Abbreviations and Equations Symbols/Constants Calculator (1 pts.) Item 6: Question Which is the largest mass? 1.0 mol He 1.00x106 atoms Ag 0.50 mol H2 10.0 g Ca 50 age red How much mental effort did you expend on this question? Low 12 3 04 5 High tatus Submit and Next Skip to Previous Skip to Next eted the pe here to search

Explanation / Answer

1.for comparing the masses, all the units are to be changed to mass in gm.

moles= mass/molar mass. mass of Helium= moles* molar mass =1*4= 4 gm

2. 1 mole of any substance contains 6.023*1023 atom

1*106 atoms are there in 1*106/ (6.023*1023) moles =1.66*10-18moles

moles= mass/atomic weight, atomic weight= 108 g/mole

mass= moles* atomic mass of Ag= 108*1.66*10-18 =1.79*10-16 gm

3. molar mass of H2O= 18 g/mole, mass of water= moles* molar mass= 0.5*18= 9 gm

4. 10 gm of Ca

hence highest mass is that of Ca.

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