LTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) How many argon atoms are contained in 7.66105 mmol of argon? A) 1.841028Ar atoms 1) B) 7.861020Ar atoms C) 4.611026Ar atoms D) 1.151028 Ar atoms E) 3.241026Ar atoms 2) How many xenon atoms are contained in 2.36 moles of xenon? A) 7.911025 xenon atoms 2) B) 1.421024 enon atoms C) 1.871026 xenon atoms D) 3.921024 xenon atoms E) 2.551023 xenon atoms 3) Calculate the mass (in ng) of 2.331020 atoms of oxygen. A) 2.25103ng B) 1.62107ng C) 4.69107ng D) 6.19106ng E) 3.73106ng 4) Calculate the mass (in kg ) of 4.871025 atoms of Zn. A) 8.09kg B) 1.09kg C) 1.89kg D) 5.29kg E) 1.24kg 3) 5) How many phosphorus atoms are contained in 158kg of phosphorus? A) 8.471024 phosphorus atoms B) 3.071027 phosphorus atoms C) 2.951027 phosphorus atoms D) 3.251028 phosphorus atoms E) 1.181024 phosphorus atoms 6) How many iron atoms are contained in 354g of iron? A) 3.821024Fe atoms 6) B) 9.501022Fe atoms C) 2.621025Fe atoms D) 4.691024Fe atoms E) 2.131026Fe atoms 7) How many meles of Crare contained in 595kg of Cs ? A) 1.26103 moles Cs. B) 4.48.103 moles Cs C) 7.91 - 104 moles Cs D) 223.102 moles Cs E) 5:39102 moles Cs 8) How many moles of Kr are contained in 398mg of Kr ? A) 1.19104 moles Kr B) 4.75 : 103 moles Kr C) 33.4 moles Kr D) 2.99103 moles Kr E) 2.11104 moles Kr 9) What mass (in mg) does 2.63 moles of nickel have? A) 129mg B) 44.8mg C) 3.56105mg D) 1.51105mg E) 2.23104mg 10) Calculate the atomic mass of element " X ", if it has 2 naturally occurring isotopes with the following 10) masses and natural abundances. 8) X45X4744.8776amu46.9443amu32.88%67.12% A) 46.26 amu B) 45.91 amu C) 46.84amu D) 44.99 amu 9). 11) Gallium has an atomic mass of 69.723amu. The Ga-69 (68.926 amu) is 60.11%. What is the amu the other isotope? A)70.924amuB)70.928amuC)70.920amuD)70.932amu 12)Silverhasanatomicmassof107.868amu.TheAg-109isotope(108.905amu)is48.16%.Whatis the amu of the other isotope? the amu of the other isotope? A) 106.911 amu B) 106.908amu C) 106.903amu D) 106.905ama 12) 13) Calculate the atomic mass of gallium if gallium has 2 naturally occurring isotopes with the following masses and naturil abund ances: Ga-69Ga-7168.9256amu70.9247amu60.11%39.89% A) 69.80amu B) 70.68amu C) 69.93amu D) 70.00 amu 13)