Answer is: 2,42·10²² atoms of gold.
<span>1 ounce (oz) is equal to 28,34952 grams (g).
</span>0,375 oz = 10,631 g.
75% gold = 10,631 g · 0,75 = 7,973 g.
n(Au) = m(Au) ÷ M(Au).
n(Au) = 7,973 g ÷ 197 g/mol.
n(Au) = 0,0404 mol.
N(Au) = n(Au) · Na.
N(Au) = 0,0404 mol · 6,023·10²³ 1/mol.
N(Au) = 2,42·10²².
n - amount of substance.
Na - Avogadro number.
Membranes are barriers and “gatekeepers”, they only let certain molecules pass through them.
they also transport nutrients to the cell
Answer
is: Ksp for AB₂ is 2.06·10⁻¹⁰.<span>
Chemical reaction: AB</span>₂(s) → Aˣ⁺(aq) + 2Bⁿ⁻(aq).
<span>
s(AB</span><span>₂) =
3,72·10⁻⁴ M.</span><span>
s(AB</span>₂) =
s(Aˣ⁺).
s(Bⁿ⁻) =
2s(AB₂).
Ksp(AB₂) = s(Aˣ⁺) ·
(s(Bⁿ⁻))².<span>
Ksp</span>(AB₂) = 3,72·10⁻⁴ ·
(7,44·10⁻⁴)².
Ksp(AB₂)= 2,06·10⁻¹⁰.
Answer:
it is he
Explanation:
beacuse Noble gases have 2 volence