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If two different isotopes have the same atomic number,it must mean that


A) they have the same atomic mass.
B) they have the same mass number.
C) they have the same number of protons.
D) they have the same number of electrons.
E) they have the same number of neutrons.

F) C) and D)
G) A) and B)

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The fully hydrated form of sodium sulfate is the decahydrate, Na2SO4. 10H2O.This compound dehydrates (loses some waters of hydration) when heated.A sample of partially dehydrated sodium sulfate was found to have a molar mass of 232.1 g/mol.How many water molecules are found  per formula unit \underline{\text{ per formula unit }} in in this sample? (i.e.determine n in Na2SO4.nH2O) .


A) 5 waters.
B) 6 waters.
C) 7 waters.
D) 8 waters.
E) 3 waters.

F) B) and D)
G) B) and C)

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Silver has two stable isotopes with masses of 106.90509 u and 108.9047 u.The atomic weight of silver is 107.868 u.What is the percent abundance of each isotope?


A) 50.0% Ag-107 and 50.0% Ag-109
B) 51.8% Ag-107 and 48.2% Ag-109
C) 55.4% Ag-107 and 44.6% Ag-109
D) 48.2% Ag-107 and 51.8% Ag-109
E) 44.6% Ag-107 and 55.4% Ag-109

F) C) and E)
G) C) and D)

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What is the molar mass of calcium chloride hexahydrate?


A) 75.53 g/mol
B) 111.0 g/mol
C) 117.0 g/mol
D) 183.6 g/mol
E) 219.1 g/mol

F) D) and E)
G) C) and D)

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What is the atomic symbol for an element with 16 protons and 17 neutrons?


A) What is the atomic symbol for an element with 16 protons and 17 neutrons? A)    B)    C)    D)    E)
B) What is the atomic symbol for an element with 16 protons and 17 neutrons? A)    B)    C)    D)    E)
C) What is the atomic symbol for an element with 16 protons and 17 neutrons? A)    B)    C)    D)    E)
D) What is the atomic symbol for an element with 16 protons and 17 neutrons? A)    B)    C)    D)    E)
E) What is the atomic symbol for an element with 16 protons and 17 neutrons? A)    B)    C)    D)    E)

F) C) and D)
G) A) and B)

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