Answer:
There are 0.0186 moles of formula units in 6.35 grams of aluminum sulfate 
.
Explanation:
What's the empirical formula of aluminum sulfate?
Sulfate is an anion with a charge of -2 per ion. When sulfate ions are bonded to metals, the compound is likely ionic.
Aluminum is a group III metal. Its ions tend to carry a charge of +3 per ion.
The empirical formula of an ionic compound shall balance the charge on ions with as few ions as possible.
The least common multiple of 2 and 3 is 6. That is:
- Three sulfate ions
will give a charge of -6. - Two aluminum ions
will give a charge of +6.
Pairing three ions with two will balance the charge. Hence the empirical formula: .
What's the mass of one mole of aluminum sulfate? In other words, what's the formula mass of ?
Refer to a modern periodic table for relative atomic mass data:
- Al: 26.982;
- S: 32.06;
- O: 15.999.
There are
- two Al,
- three S, and
- twelve O
in one formula unit of .
Hence the formula mass of :
.
How many moles of formula units in 6.35 grams of ?
.
Dalton's atomic theory was based on the law of conservation of mass which states that the matter can neither be created nor be destroyed but it can only transformed into one form or another. In a chemical reaction, total mass of the reactants will be equal to the total mass of the products.
Taking an example,
Mass of 
= 16g
Mass of 
= 
Total mass on reactant side = 
Total mass on reactant side = 80g
Mass of 
= 44g
Mass of 
Total mass on product side = 
Total mass on product side = 80g
It is seen from the above example that the
total mass on reactant side = total mass on product side.
Water always boils at 212 degrees F, or 100 degrees C. Because the boiling point is not dependent on the size of the sample of water, it would be an intensive property.
Answer:
The liquid molecules stay towards the bottom but one or two do make it all the way to the top. The molecules in the gas are also moving faster than the molecules in the liquid phase.
