Electron affinity is the change in energy of an atom with a neutral charge when an electron is added to form an anion. A more negative electron affinity corresponds to a greater attraction for an electron. Electron affinity become less negative down a group and from left to right in the periodic table.
Answer:
If the hydrated salt is overheated, it causes the anhydrous salt to decompose, causing the product to be lost as gas. The reported percentage of water loss will be too high because the gap between the initial measurement and final (which will be lower due to loss of sample) measurement will widen.
<u>Answer:</u> The correct answer is Option C.
<u>Explanation:</u>
To calculate the number of moles, we use the equation:

Given mass of methane = 48.2 g
Molar mass of methane = 16 g/mol
Putting values in above equation, we get:

According to mole concept:
1 mole of compound contains
number of molecules.
So, 3.0125 moles of methane will contain =
number of molecules.
Hence, the correct answer is Option C.
Answer:A,D
Explanation:
Option a:
Sodium has charge 
Hydroxide has charge
.
So,sodium hydroxide is balanced.
Option b:
Magnesium has charge 
Two sulphates has a charge of
.
So,magnesium sulphate is not balanced.
Option c:
Magnesium has charge 
Two hydroxides have a charge of
.
So,magnesium hydroxide is balanced.
Option d:
Sodium has charge 
Sulphate has charge
.
So,sodium sulphate is not balanced.
Stored water is gravitational