A. Chocolate syrup dissolve in milk because the milk is changing
Answer:
#1- the percentage is 2.77%
#2 - 218.1336g
#3- 7.89%
#4- 63.8489g
#5- 136.1406g
#6- 340.3515g
#7- 2.387238
#8-
Explanation:
Answer:
The empirical formula would be Fe2o3
Explanation:
you first take the grams or the percent of each element, then transform them from grams to moles.
After getting the number of mols you want to divide each mol by the lowest number of mol.
EX) for this problem the number of moles of Fe(iron) would be 1.253 mol and the moles for the oxygen would be 1.881 mol... so you take the lowest, 1.253, and divide both to get what's called a mol fraction.
1.253/ 1.253 =1Fe
1.881/ 1.253= 1.5
now we want a whole number since we're finding the formula of a compound... and since there is a 1.5 you would multiple that by 2 giving you 3 for oxygen and giving you 2 for iron.
then these whole numbers will give you the subscripts that's needed for your empirical formula :)
- Hope this helps!!!
Answer:
0.161 moles
Explanation:
Given parameters:
Mass of Fe = 18g
Unknown:
Number of moles of Fe₂O₃ = ?
Solution:
To solve this problem, we have to work from the known to the unknown specie.
One cogent point we need to take from this problem is that oxygen gas is in excess. The Fe reacting is therefore the limiting reactant which implies that it will determine the extent of the reaction.
Now, the known specie is Fe;
The balanced reaction equation is shown below;
4Fe + 3O₂ → 2Fe₂O₃
Proceed to find the number of moles of Fe given;
Number of moles of Fe = 
Molar mass of Fe = 56g/mol
Number of moles of Fe =
= 0.32mole
From the balanced reaction equation;
4 moles of Fe produced 2 moles of Fe₂O₃
0.32 moles of Fe will produce
= 0.161 moles of Fe₂O₃
Unshared/lone pairs of valence electrons :)