Answer:
The answer to your question is Cu(NO₃)₂
Explanation:
To write the chemical formula of a molecule:
1.- Look for the symbols of the elements
Copper = Cu has an oxidation number of +2.
Nitrate = NO₃⁻¹ nitrate is a polyatomic ion so it is composed of nitrogen,
oxygen and its oxidation number is -1.
2.- Write the chemical formula and interchange the oxidation numbers.
Cu⁺² + NO₃⁻¹ ⇒ Cu(NO₃)₂
Answer:
0.47 M
Explanation:
The concentration of the solution can be calculated using the following equation:

<u>Where:</u>
V: is the volume of the solution = 68.6x10⁻² L
η: is the moles of cobalt (II) sulfate
m: is the mass of cobalt (II) sulfate = 89.94 g
M: is the molar mass of cobalt (II) sulfate = 281.103 g/mol
The concentration of cobalt (II) sulfate is:
We used the molar mass of the cobalt (II) sulfate heptahydrate (281.103 g/mol) since it is one of the most common salts of cobalt.
Therefore, the concentration of a solution of cobalt (II) sulfate is 0.47 M (assuming that the cobalt (II) sulfate is heptahydrate).
I hope it helps you!
Explanation:
PbI2 is the precipitate.................