Describe the relationship between gravitational force and distance as shown in the diagram.
1 answer:
You might be interested in
Answer:
Mole percent of water in azeotrope is 69%
Explanation:
Clearly, the azeotrope consists of water and perchloric acid.
So, 72% perchloric acid by mass means 100 g of azeotrope contains 72 g of perchloric acid and 28 g of water.
Molar mass of water = 18.02 g/mol and molar mass of perchloric acid = 100.46 g/mol
So, 72 g of perchloric acid = of perchloric acid = 0.72 mol of perchloric acid
Also, 28 g of water = of water = 1.6 mol of water
Hence total number of mol in azeotrope = (1.6+0.72) mol = 2.32 mol of azeotrope
So, mole percent of water in azeotrope = [(moles of water)/(total no of moles)]%
Mole percent of water = % = 69%
Answer:
There are approximately of formula units in that
of
(the solute of this solution.)
Explanation:
A solution includes two substances: the solute and the solvent. Note the solution here contains significantly more water than . Hence, assume that water is the solvent (as it is in many other solutions.)
The (molar) formula mass of is necessary for finding the number of moles of
- One
atom,
- One
atom, and
- One
atom.
The formula mass of will thus be the sum of:
- The mass of one mole of
- The mass of one mole of
- The mass of one mole of
atoms.
On the other hand, the mass (in grams) of one mole of atoms of an element is (numerically) the same as its relative atomic mass. The relative atomic mass data can be found on most modern periodic tables.
Relative atomic mass data from a modern periodic table:
.
.
.
For example, the relative atomic mass of (potassium, atomic number
) is
(3 sig. fig.) Hence, the mass of one mole of
The formula mass of is the sum of these three masses:
.
The number of moles of formula units in this
sample would be:
.