Answer:
32.8%
Explanation:
All of the Pb⁺² species precipitated as lead(II) cromate, PbCrO₄ (we know this as excess K₂CrO₄ was used).
First we convert 0.130 g of PbCrO₄ into moles, using its molar mass:
- 0.130 g ÷ 323 g/mol = 4.02x10⁻⁴ mol PbCrO₄
There's 1 Pb⁺² mol per PbCrO₄ mol, so in total 4.02x10⁻⁴ moles of Pb⁺² were in the ethanoate sample.
We <u>convert those 4.02x10⁻⁴ moles of Pb into grams</u>:
- 4.02x10⁻⁴ mol * 207 g/mol = 0.083 g Pb
Finally we calculate the percentage composition of Pb:
- 0.083 g Pb / 0.254 g salt * 100% = 32.8%
Answer:
Molecule
Explanation:
Molecule is defined as the discrete group of atoms that are held together by sharing valence electrons.
This is because two or more atoms is known as a molecule and for electron sharing to occur then there must be a minimum of two atoms which is also known as a molecule present in the sharing process.
689
Explanation:
Ritz thks t too okay if appeal type topic topic egg Enzo team 6 users Elba room
Answer: Option (c) is the correct answer.
Explanation:
The given reaction is as follows.
Number of atoms on reactant side are as follows.
Number of atoms on product side are as follows.
To balance the given equation, we multiply Fe by 2 and 
by 3 on the reactant side. Therefore, the balanced chemical equation will be as follows.
Thus, the coefficient of is 3.
Answer:
Perhaps the best example of such a paradigm shift in science is the Copernican revolution in cosmology: the move from a geocentric to the heliocentric view of our solar system.
Explanation:
