Answer:
A1. Sr + 2
A2. P - 3
B1. Sr3P2
Explanation:
A1. Strontium ion | Sr+2
Description: Strontium(2+) is a strontium cation
Molecular Formula: Sr+2
A2. PubChem CID 5182128
Structure Find Similar Structures
Molecular Formula P-3
B. Strontium phosphide
PubChem CID 166710
Structure Find Similar Structures
Molecular Formula Sr3P2 or P2Sr3
One mole of any element is Avogadro's number, which is 6.02 * 10^23 atoms.
One mole of Calcium is equal to its atomic weight in grams, 1 mole Ca = 40.08 x 1000 mg = 6.02 * 10^23 atoms.
We have 8.6mg of Ca which means 8.6mg / 40,080mg = .00021457 of a mole of calcium.
Now multiply that by Avogadro's number which gives number of atoms = 0.00021457 * 6.02 * 10^23 atoms. So the answer is 1.292 * 10^20 atoms of Ca.
Answer:
The equilibrium constant K is 0.1967
Explanation:
Chemical equilibrium is a state of a reacting system in which no observed changes over time, even though the reaction continues. It occurs in reversible reactions, where the rate of reaction of reagents to products is the same as that of products to reagents.
The chemical equation can be written as:
a A + b B → c C + d D
Where a, b, c, d are the stoichiometric coefficients of the reaction and A, B, C, D are the symbols or formulas of the different substances involved.
The equilibrium constant K can be defined as the ratio between the product between the concentrations of the products (in equilibrium) raised to their corresponding stoichiometric coefficients, and the product of the concentrations of the reactants (in equilibrium) raised in their corresponding stoichiometric coefficients:
![Kc=\frac{[C]^{c} *[D]^{d} }{[A]^{a} *[B]^{b} }](https://tex.z-dn.net/?f=Kc%3D%5Cfrac%7B%5BC%5D%5E%7Bc%7D%20%2A%5BD%5D%5E%7Bd%7D%20%7D%7B%5BA%5D%5E%7Ba%7D%20%2A%5BB%5D%5E%7Bb%7D%20%7D)
In this case:
![Kc=\frac{[CO]*[H_{2}O] }{[CO_{2}]*[H_{2}] }](https://tex.z-dn.net/?f=Kc%3D%5Cfrac%7B%5BCO%5D%2A%5BH_%7B2%7DO%5D%20%7D%7B%5BCO_%7B2%7D%5D%2A%5BH_%7B2%7D%5D%20%20%7D)
You know that:
Replacing:

Kc= 0.1967
<u><em>The equilibrium constant K is 0.1967</em></u>
Both are in the nucleus of a atom
Answer:
30
Explanation:
A valance electron is an electron in the outer shell. Both Sulfur and Oxygen have 6 valance electrons. Because there is 1 sulfur atom and 4 oxygen atoms in SO4, that means it is 5x6, giving 30 valance electrons.