Answer:
Water softening is the process of removing the dissolved calcium and magnesium salts that cause hardness in water
Explanation:
Answer : The concentration of
ion is 
Explanation :
First we have to calculate the moles of
.

The balanced chemical reaction will be:

From the reaction we conclude that,
1 mole of
dissociate to give 3 moles of
ion and 1 mole of
ion
So,
0.03 mole of
dissociate to give
moles of
ion and 0.03 mole of
ion
Now we have to calculate the concentration of
ion.


Therefore, the concentration of
ion is 
Pt195 having 78 atomic number is the daughter nucleus produced when Au195 undergoes electron capture.
An unstable isotopes can undergoes radioactive decay to form a more stable isotopes . Initial isotopes is called parent nuclide and the resultant isotopes from radioactive decay is called the daughter nuclide There are several radioactive decay like alpha decay , beta decay , gamma decay , electron capture etc .
In electron capture , the atom have only one less which is daughter isotopes than electron than atomic number of parent isotopes.
learn more about isotopes,
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The given question is incomplete. The complete question is :
Gaseous butane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . If 1.31g of water is produced from the reaction of 4.65g of butane and 10.8g of oxygen gas, calculate the percent yield of water. Be sure your answer has the correct number of significant digits in it.
Answer: 28.0 %
Explanation:
To calculate the moles :


According to stoichiometry :
13 moles of
require 2 moles of butane
Thus 0.34 moles of
will require=
of butane
Thus
is the limiting reagent as it limits the formation of product and butane is the excess reagent.
As 13 moles of
give = 10 moles of 
Thus 0.34 moles of
give =
of 
Mass of 


The percent yield of water is 28.0 %
Answer:
There are 3 significant figures