Answer:B:63.75
Explanation:(5/8 x 63)+(3/8 x 65)=(0.625 x 63)+(0.375 x 65)=63.75
Answer:
Approximately 
(note that 
.)
Explanation:
The molarity of a solution gives the number of moles of solute in each unit volume of the solution. In this 
solution in water,
Let 
be the number of moles of the solute in the whole solution. Let 
represent the volume of that solution. The formula for the molarity 
of that solution is:
.
In this question, the volume of the solution is known to be 
. That's 
in standard units. What needs to be found is , the number of moles of in that solution.
The molar mass (formula mass) of a compound gives the mass of each mole of units of this compound. For example, the molar mass of is 
means that the mass of one mole of
.
For this question,
.
Calculate the molarity of this solution:
.
Note that 
(one mole per liter solution) is the same as 
.
Answer:
Yes, diamond can be burned. The most common form of burning in everyday life is carbon combustion. In carbon combustion, carbon atoms break their bonds with each other and with other atoms (which requires energy) to form bonds with oxygen atoms (which releases even more energy than first required). The net extra energy released in this reaction can then go on to rip more carbon atoms free of their non-oxygen neighbors, thus continuing the reaction, or the energy can escape as heat and ligh
Explanation:
<h2>Hello!</h2>
The answer is: 
<h2>Why?</h2>
First, we need to look for the K molecular mass:
Also, we need to remember that 1 mol of a compound or element is equal to 
of that compound.
From the statement, we are asked to calculate how many atoms of K are present in 195,49 of K.
So, doing the calculations, we have:
So, we have atoms of K in 195,49 grams of K.
Have a nice day!
Answer:
All the above.
Explanation:
Energy is defined as the ability to do work. And changes in every occur in all changes of matter. Energy is neither created nor destroyed in these changes, but simply changes from on form to another.
