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>
Water left in a freezer is called ice
One thing incorrect is that when dealing with a compound, such as H2SO4, that has 7 atoms in the chemical formula, the polyatomic ion SO4 doesn’t dissociate into one Sulfur and four Oxygens. SO4 stays and a PAI.
<span>Throughout the development of particle physics, scientists have created different models to understand the atom. When we are talking about the diameter of an atom, we would refer to the Bohr radius, which is the radius from the nucleus to the orbiting electron.
In this case, a hydrogen atom has one electron, and the Bohr radius in the ground state is 5.29 x 10^{-11} meters. To find the diameter, we just multiply the Bohr radius by 2.
diameter = 2 x 5.29 x 10^{-11} meters
diameter = 10.58 x 10^{-11} meters
diameter = 1.058 x 10^{-10} meters
The diameter of a hydrogen atom in ground state is:
1.058 x 10^{-10} meters</span>
