Answer:
22.95g
Explanation:
Given parameters:
Percentage by mass of silver in silver iodide = 45.9%
Mass of silver iodide given = 50g
Unknown:
Mass of silver in silver iodide = ?
Solution:
The formula of the compound is;
Silver iodide = AgI
Since the percentage by mass of silver in the compound is 45.9%;
Mass of silver = percentage by mass of silver x mass of AgI
Mass of silver =
x 50 = 22.95g
Answer:
![\boxed{\text{10 \%}}](https://tex.z-dn.net/?f=%5Cboxed%7B%5Ctext%7B10%20%5C%25%7D%7D)
Explanation:
The formula for efficiency is
![\begin{array}{rcl}\text{Efficiency} & = & \dfrac{\text{useful energy out}}{\text{energy in}} \times 100 \,\% \\\\\eta & = & \dfrac{w_{\text{out}}}{w_{\text{in}} } \times 100 \,\%\\\end{array}](https://tex.z-dn.net/?f=%5Cbegin%7Barray%7D%7Brcl%7D%5Ctext%7BEfficiency%7D%20%26%20%3D%20%26%20%5Cdfrac%7B%5Ctext%7Buseful%20energy%20out%7D%7D%7B%5Ctext%7Benergy%20in%7D%7D%20%5Ctimes%20100%20%5C%2C%5C%25%20%5C%5C%5C%5C%5Ceta%20%26%20%3D%20%26%20%5Cdfrac%7Bw_%7B%5Ctext%7Bout%7D%7D%7D%7Bw_%7B%5Ctext%7Bin%7D%7D%20%7D%20%5Ctimes%20100%20%5C%2C%5C%25%5C%5C%5Cend%7Barray%7D)
Data:
Useful energy = 3 J
Energy input = 30 J
Calculation:
![\begin{array}{rcl}\eta & = & \dfrac{\text{3 J}}{\text{30 J}} \times 100 \,\%\\\\\eta & = & 10 \, \%\\\end{array}\\\text{ The efficiency is }\boxed{\textbf{10 \%}}](https://tex.z-dn.net/?f=%5Cbegin%7Barray%7D%7Brcl%7D%5Ceta%20%26%20%3D%20%26%20%5Cdfrac%7B%5Ctext%7B3%20J%7D%7D%7B%5Ctext%7B30%20J%7D%7D%20%5Ctimes%20100%20%5C%2C%5C%25%5C%5C%5C%5C%5Ceta%20%26%20%3D%20%26%2010%20%5C%2C%20%5C%25%5C%5C%5Cend%7Barray%7D%5C%5C%5Ctext%7B%20The%20efficiency%20is%20%7D%5Cboxed%7B%5Ctextbf%7B10%20%5C%25%7D%7D)
The best answer is (3)
In these kind of reactions, there is a transfer of electrons from one reactant to another. electrons are lost from one substance and gained by another.
Oxidation is loss of electrons from a substance, and Reduction is gain of electrons by a substance.
These two processes cannot occur without the other. If there is a reduction there must be an oxidation reaction and vice versa. The reactions usually occur simultaneously.
For example, table salt is formed by a redox reaction. Sodium is oxidized i.e. loses an electron (and becomes positively charged) while chlorine gas is reduced i.e. gains the electron (and become negatively charged). The result is formation of sodium chloride.
Answer:
ions have are charged and molecules are not
Explanation: