Answer : The mass of
needed are, 1.515 grams.
Explanation :
First we have to calculate the mole of
.

Now we have to calculate the moles of
.
The balanced chemical reaction will be,
produced from 1 mole of 
So, 0.005 mole of
produced from 0.005 mole of 
Now we have to calculate the mass of 


Therefore, the mass of
needed are, 1.515 grams.
72g H2O x 1 mol H2O/18.02g H2O = 3.99 mol H2O
Answer:
0.22
Explanation:
Given, Mass of
= 46.85 g
Molar mass of
= 299.4 g/mol
The formula for the calculation of moles is shown below:
Thus,
Given, Mass of
= 125.5 g
Molar mass of
= 46.07 g/mol
The formula for the calculation of moles is shown below:
Thus,
So, according to definition of mole fraction:

It is 31.75g of copper is contained in .50 mole of copper.
There are 2 covalent bonds between the Nitrogen and Oxygen, and 1 between the Nitrogen and Chlorine.
It should be 3.