KEISER UNIVERSITY CHM2045S General Chemistry Final Test-3/29 18 Student 1. Molec
ID: 1034965 • Letter: K
Question
KEISER UNIVERSITY CHM2045S General Chemistry Final Test-3/29 18 Student 1. Molecular weight of FeSO4.7HaO is a. 278 g/mal b. 156 glmol c. 188.6 g/mol d. None of the above 2. According to VSEPR theory a. Electron groups are stable when they are far apart from each other b. Lone pairs of electrons have more repulsive nature C. Molocular d. All the above cular Geometry can be predicted based on electron geometry 3. The following is not an example of molecular element a. Oxygen C. Chlorine d. Hydrogen a. John Dalton c. JJ Thomson 4. Neutron was discovered and their mass was characterized by b. Emest Rutherford d. James Chadwik is demonstrated by a. Carbon and oxygen are in fixed proportion to make carbon dioxide b. Hydrogen and oxygen are in fixed proportion to make water c. Nitrogen and hydrogen are in fixed proportion to make ammonia d. AN the above 6. Br exists in two isotopic forms Cl-35 and C-37. AMU of Chlorine is 35.45. Based on the AMU of 35.45 the naturally abundant isotope is ?. ?-35 b. CI-37 c. Both equally d. Cannot determine 7. An atom contains 31 protons, 39 neutrons and 31 electrons. The element is a. Mercurty b. Samerium C. Yitrium d. GalliumExplanation / Answer
1.
Molecular weight of FeSO4.7H2O = 1*(at. wt. of Fe) + 1*(at. wt. of S) + 11*(at. wt. of O) + 14*(at. wt. of H)
= 1 ( 56 ) + 1 ( 32 ) + 11 ( 16 ) + 14 ( 1 )
= 278 g/mol
(a)
2. (d)
3. (b) Sulphur
4. (d) James Chadwick
5. (d) All the above
6. (a) Cl-35
7. (d) Gallium ( atomic number = 31)
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