Answer:
54
Explanation:
Given an atom of Tellurium;
Tellurium has an atomic number of 52;
Unknown:
The number of electrons in a -2 anion
Solution:
The atom is;
Te²⁻
A neutral tellurium atom has 52 electrons
When it forms an anion, it becomes negatively charged;
This implies that the number of electrons becomes more,
So, the number of electrons = 52 + 2 = 54
So, the electrons are 54
Answer:
See below
Explanation:
Molarity = moles/Volume in Liters = (grams/formula wt)/Vol in Liters
=> Grams of solute = Molarity x Vol in Liters x formula wt
= (0.250M)(0.750L)(212.3g/mol)
= 39.8 grams
Answer is: <span>the acidity of water reduce the mass of seashells.
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Balanced chemical reaction:
CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + CO₂(g) + H₂O(l).
Calcium carbonate (CaCO₃) dissolves in hydrochloric acid and gas carbon(IV) oxide is formed.
Calcium carbonate is inorganic salt insoluble in water, but soluble in acidic solutions.
It is a mixture because it is made up of three different kinds of minerals, feldspar, quartz, and mica which are mixed together<span>
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