Answer:
B. LiF < CH6N < H2O2 <I2
Explanation:
Find the molar mass of LiF
To do that, first look at the atomic mass of each element on the periodic table.
<h3>Li = 6.9 amu</h3><h3>F = 19.0 amu</h3>
But they are one lithium atom and one fluorine atom
So you use this equation:
<h3>6.9(1) + 19.0(1) = 25.9</h3>
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.
<h3>C = 12.0 amu</h3><h3>H = 1.0 amu</h3><h3>N = 14.0 amu</h3>
But they are six hydrogen atoms, one carbon atom, and one nitrogen atom.
So you use this equation:
<h3>12.0 + 1.0(6) + 14.0 = 32 </h3>
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.
<h3>H = 1.0 amu</h3><h3>O = 16.0</h3>
But they are two oxygen atoms and two hydrogen atoms.
So you use this equation:
<h3>1.0(2) + 16.0(2) = 34 </h3>
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.
<h3>I = 126.9 amu</h3>
But they are two iodine atoms.
So you use this equation:
<h3>126.9(2) = 253.8 </h3>
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.
<h3>So LiF has the lowest molar mass(which is 25.9).</h3><h3>CH6N has the second lowest molar mass(which is 32). </h3><h3>H2O2 has the second highest molar mass(which is 34)</h3><h3>I2 has the highest molar mass(which is 253.8)</h3><h3>
25.9 < 32 < 34 < 253.8</h3><h3>
</h3>
Therefore, the final answer is B. LiF < CH6N < H2O2 <I2
Hope it helped!