Arrange the following in order of increasing mass:
1. one F atom
2. 1x10^-20 mol of F
3. 1x10^-20g of F
4. one F2 molecule
A. 1<2<3<4
B. 1<4<3<2
C. 3<1<2<4
D. 2<1<3<4
E. none of these
I'm thinking C
1. 3x10^-23g
2. 2x10^-19g
3. 1x10^-20g
4. 6x10^-23g
I got B.
You are correct. The correct answer is C, which means the correct order of increasing mass is:
3. 1x10^-20g of F
1. one F atom
2. 1x10^-20 mol of F
4. one F2 molecule
The order is determined based on the mass of each entity.
To compare the masses of the given quantities, we need to understand their units and conversion factors. Let's break down each option and see how they relate to each other.
1. One F atom: The atomic mass of fluorine (F) is approximately 19 g/mol. Since there is only one atom, the mass would be 19 g/mol.
2. 1x10^-20 mol of F: This quantity is given in terms of moles and represents a very small amount. To determine the mass, we need to multiply the number of moles by the molar mass of F. Using the atomic mass of fluorine (19 g/mol), we can convert the given amount as follows:
1x10^-20 mol of F * 19 g/mol = 1.9x10^-19 g of F
3. 1x10^-20g of F: This quantity is already given in grams and does not require any additional calculations. It is the same as 1x10^-20 g of F.
4. One F2 molecule: The molecular formula for fluorine gas is F2. The molecular mass of F2 is the sum of the atomic masses of two fluorine atoms (2 * 19 g/mol = 38 g/mol).
Now that we have calculated the masses of the given quantities, let's compare them in order:
1 < 2 < 3 < 4
Therefore, the correct answer is A. 1 < 2 < 3 < 4.