Answer:
its atomic number will be 3 and it's mass number will be 7. it is lithium
D has a total of four significant figures.
The balanced chemical equation for the production of chromium metal from the reaction of chromium(ll) nitrate reacts with a strip of zinc is:
3 Zn + 2 Cr(NO₃)₃ → 2 Cr + 3 Zn(NO₃)₂
This is a redox reaction, which <u>is a chemical reaction in which one or more electrons are transferred between the reagents</u>, causing a change in their oxidation states. In the proposed reaction, Cr oxidation state goes from +3 to 0, becoming metallic chromium, while Zn goes from being Zn⁰ to Zn²⁺.
<u>The mass of chromium metal produced in the above reaction will be,</u>
425.0 mL x
x
x
x
= 5.52 g
So, the mass of chromium metal produced when 425.0mL of 0.25M chromium(ll) nitrate reacts with a strip of zinc that remains in excess is 5.52 g of Cr.
Answer:
![1190\ \text{mL}](https://tex.z-dn.net/?f=1190%5C%20%5Ctext%7BmL%7D)
Explanation:
= Initial Concentration of KCl = 2.7 M
= Volume of KCl = 1 M
= Final concentration of KCl = 1 M
= Amount of water
We have the relation
![M_1V_1=M_2V_2\\\Rightarrow V_2=\dfrac{M_1V_1}{M_2}\\\Rightarrow V_2=\dfrac{2.7\times 700}{1}\\\Rightarrow V_2=1890\ \text{mL}](https://tex.z-dn.net/?f=M_1V_1%3DM_2V_2%5C%5C%5CRightarrow%20V_2%3D%5Cdfrac%7BM_1V_1%7D%7BM_2%7D%5C%5C%5CRightarrow%20V_2%3D%5Cdfrac%7B2.7%5Ctimes%20700%7D%7B1%7D%5C%5C%5CRightarrow%20V_2%3D1890%5C%20%5Ctext%7BmL%7D)
The amount of water that is to be added is
.