Answer:
Cobalt lose 3 electrons and donate 12 electrons.
Explanation:
In the periodic table,cobalt has nine electrons .It has lost 3 electrons,so it is only six left.Once it forms the complex,each ammonia donates a pair of electrons.
Answer:
solid
Explanation:
they are all stuck together
Given :
It takes 45.60 mL of a 0.225 M hydrochloric acid solution to react completely with 25.00 mL of calcium hydroxide in the given reaction.
2HCl(aq) + Ca(OH)2(aq) --> CaCl2(aq) + 2H2O(l)
To Find :
The molar concentration of the calcium hydroxide solution.
Solution :
From given equation 2 mole of hydrochloric acid react with 1 mole of calcium hydroxide.
So,
![2M_1V_1 = M_2V_2\\\\2\times 0.225 \times 45.60 = M_2 \times 25 \\\\M_2 = \dfrac{20.52}{25}\\\\M_2 = 0.8208 \ M](https://tex.z-dn.net/?f=2M_1V_1%20%3D%20M_2V_2%5C%5C%5C%5C2%5Ctimes%200.225%20%5Ctimes%2045.60%20%3D%20M_2%20%5Ctimes%2025%20%5C%5C%5C%5CM_2%20%3D%20%5Cdfrac%7B20.52%7D%7B25%7D%5C%5C%5C%5CM_2%20%3D%200.8208%20%5C%20M)
Therefore, molar concentration of the calcium hydroxide solution is 0.8208 M.
Answer: Hydrogen, Nitrogen, Flourine, Oxygen, Iodine, Chlorine and Bromine
Explanation:
<span>The first method to determine the chemical composition of a substance in space was using light. By determining red shift in the observed spectrum of light they could determine the elements they were observing. Different elements change the way light behaves and from this scientists can determine the makeup of things such as stars and nebulas.</span>