Answer:
18 moles de ácido
Explanation:
A reação de óxido de alumínio com ácido sulfúrico é:
Al₂O₃ + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂O
<em>Onde 1 mol de óxido de alumínio reaciona com 3 moles de ácido sulfúrico produzendo 1 mol de sulfato de alumínio e 3 moles de água.</em>
Agora, se você quizer produzir 6 moles de sulfato de alumínio, e você sabe que 3 moles de ácido formam 1 mol de sulfato, as moles de ácido que você precisa são:
6 moles Al₂(SO₄)₃ × ( 3 moles H₂SO₄ / 1mole Al₂(SO₄)₃) = <em>18 moles de ácido</em>
for a clear understanding of how closely they are related, scientists compare their DNA, an essential molecule that's the instruction manual for building each species. Humans and chimps share a surprising 99 percent of their DNA.
Example 1: Crushing a can.
Type of change:
Developmental – May be either planned or emergent; it is first order, or incremental. ...
Transitional – Seeks to achieve a known desired state that is different from the existing one. ...
Transformational – Is radical or second order in nature.
Answer:
D) atomic radii increase from top to bottom of a group
Explanation:
Atomic radii trend along group:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.
Other options are incorrect because,
A) atomic radii increase from left to right across the period
Correct = atomic radii decreases from left to right across the period
B) ionization energy increases from top to bottom within a family
Correct = ionization energy decreases from top to bottom within a family
C) electronegativity decreases from left to right across a period
Correct = electronegativity increases from left to right across a period
