To the correct number of significant figures the mass of exactly 250 atoms of mercury would be

To the correct number of significant figures the mass of exactly 250 atoms of mercury would be

 To the correct number of significant figures, the mass of exactly 250 atoms of mercury would be:

A)200.6 amuD)5.0100 ? 10⁴ amu

B)250 amuE)1.246 amu

C)5.015 ? 10⁴ amu

72.              To the correct number of significant figures, the mass of exactly 200 atoms of carbon is:

A)  12.01 amu    B)  24.02 amu    C)  240.2 amu    D)  2402 amu    E)  16.65 amu

73.              To the correct number of significant figures, the mass of exactly 400 atoms of magnesium is:

A)  24.31 amu    B)  9724 amu    C)  97.24 amu    D)  16.45 amu    E)  0.06078 amu

74.              When comparing 1000 amu of carbon atoms with 1000 amu of helium atoms:

A)each sample has the same number of atoms.

B)there are more carbon atoms than helium atoms.

C)there are more helium atoms than carbon atoms.

D)it is not possible to tell which sample contains more atoms.

E)helium is a gas, so it is less dense than the carbon, and therefore there would be fewer atoms.

75.              When comparing 10,000 amu of mercury atoms with 10,000 amu of iron atoms:

A)each sample has the same number of atoms.

B)there are more iron atoms than mercury atoms.

C)there are more mercury atoms than iron atoms.

D)it is not possible to tell which sample contains more atoms.

E)mercury is a liquid, so it would be less dense than the iron, and therefore there would be fewer atoms.

76.              When comparing a 10.00 g sample of iron with a 10.00 g sample of lead:

A)each sample has the same number of atoms.

B)there are more iron atoms than lead atoms.

C)there are more lead atoms than iron atoms.

D)it is not possible to tell which sample contains more atoms.

E)the lead is heavier than the iron, and therefore there would be more atoms.

77.              Which set of elements below contains, respectively, an alkali metal, a halogen, and a transition metal?

A)  Rb, Br, Ag    B)  Ca, Kr, Mn    C)  Sc, Ba, I    D)  H, F, V    E)  Li, S, Fe

78.              Which set of elements below contains, respectively, an alkaline earth metal, a noble gas, and a metalloid?

A)  Na, Ar, Si    B)  Ba, O, As    C)  Ti, Cl, Pb    D)  Bi, Kr, B    E)  Mg, Ne, Ge

79.              Which set of elements below contains, respectively, an alkaline earth metal, a noble gas, and a transition metal?

A)  Ca, Ar, Pb    B)  Mg, N, Cu    C)  Sr, He, Ni    D)  Na, Xe, Fe    E)  Li, Rn, Cr

80.              Which of the following elements does not naturally occur as a diatomic molecule?

A)  oxygen    B)  nitrogen    C)  hydrogen    D)  neon    E)  bromine