It can not be answered without experimental data.
Answer:
She needs 1.19 moles of potassium hydroxide.
Explanation:
Being the molar mass of the elements:
- K= 39 g/mole
- O= 16 g/mole
- H= 1 g/mole
then the molar mass of potassium hydroxide is:
KOH= 39 g/mole + 16 g/mole + 1 g/mole= 56 g/mole
Being the mass of one mole of a substance, which can be an element or a compound, you can apply the following rule of three: if 56 g of KOH are present in 1 mole, 66.48 g of KOH in how many moles of the compound are they?

moles of KOH= 1.19
<u><em>
She needs 1.19 moles of potassium hydroxide.</em></u>
First, you would add the products: 0.4 + 6.01 = 6.41 g
Then, to get the mass of Iron required, you would do 6.41 - 5.0 = 1.41
This is because in the conservation of mass principle it states,
mass of reactants = mass of products.
The heterogeneous mixture that has very small dispersed particles and stays mixed for a long time is colloid. Because colloid has particles that are small enough to suspended but are as large that they can scatter light.