What is the molarity of a solution of 14.0 g NH4Br in enough H2O to make 150 mL of solution?
2 answers:
Explanation:
Molarity is defined as the number of moles per liter of solution.
Mathematically, Molarity =
Since it is given that the molarity of a solution of 14.0 g and volume is 150 mL or 0.15 L.
Whereas number of moles =
So, molar mass of is 97.94 g/mol.
Thus, number of moles =
= 0.142 mol
Therefore, calculate the molarity as follows.
Molarity =
=
= 0.946 mol/L
Hence, we can conclude that molarity of the solution is 0.946 mol/L.
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Answer:
<em>Option C: 4.54 x </em><em> KJ/mol of nuclei</em>
<em>Note: </em>Here in this question option C is not correctly put. It is 4.54 x rather than 4.54 x
.
Explanation:
If mass defect is known, then nuclear binding energy can easily be calculated, here's how:
First step is to convert that mass defect into kg.
Mass defect = 5.0446 amu
Mass defect = 5.0466 x 1.6606 x
Because 1 amu = 1.6606 x Kg.
<em>Mass defect = 8.383 x </em><em> kg.</em>
Now, we need to find out it's energy equivalent by using following equation:
Using the equation E = mc²:
where c= 3.00 x m/s²
E = (8.383 x ) x (3.00 x
)²
E = 7.54 x J this energy is in Joules but nuclear binding energy is usually expressed in KJ/mol of nuclei. Let's convert it:
(7.54 x Joule/nucleus)x(1 kJ/1000 Joule)x(6.022 x
nuclei/mol) =
<em>4.54 x </em><em> kJ/mol of nuclei .</em>
E = <em>4.54 x </em><em> kJ/mol of nuclei .</em> So, this is the nuclear binding energy of that atom, which is option C.
<em>Note:</em> Here in this question option C is not correctly put. It is 4.54 x rather than 4.54 x