Answer:
B. LiF < CH6N < H2O2 <I2
Step-by-step explanation:
Find the molar mass of LiF
To do that, first look at the atomic mass of each element on the periodic table.
Li = 6.9 amu
F = 19.0 amu
But they are one lithium atom and one fluorine atom
So you use this equation:
6.9(1) + 19.0(1) = 25.9
LiF has 25.9 g/mol
Now find the molar mass of CH6N.
To do that, first look at the atomic mass of each element on the periodic table.
C = 12.0 amu
H = 1.0 amu
N = 14.0 amu
But they are six hydrogen atoms, one carbon atom, and one nitrogen atom.
So you use this equation:
12.0 + 1.0(6) + 14.0 = 32
CH6N has 32 g/mol
Now find the molar mas of H2O2
To do that, first look at the atomic mass of each element on the periodic table.
H = 1.0 amu
O = 16.0
But they are two oxygen atoms and two hydrogen atoms.
So you use this equation:
1.0(2) + 16.0(2) = 34
H2O2 has 34 g/mol.
Lastly, find the molar mass of I2
To do that, first look at the atomic mass of each element on the periodic table.
I = 126.9 amu
But they are two iodine atoms.
So you use this equation:
126.9(2) = 253.8
I2 has 253.8 g/mol
Now that we calculated the molar mass of all elements. We rank it in the following of increasing atomic mass.
So LiF has the lowest molar mass(which is 25.9).
CH6N has the second lowest molar mass(which is 32).
H2O2 has the second highest molar mass(which is 34)
I2 has the highest molar mass(which is 253.8)
25.9 < 32 < 34 < 253.8
Therefore, the final answer is B. LiF < CH6N < H2O2 <I2
Hope it helped!