How much volume (in cm3) is gained by a person who gains 11.1 lbs of pure fat?
1 answer:
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Explanation:
The reaction equation will be as follows.
So, according to this equation, 1 mole = 2 mol HBr = 1 mol
Therefore, calculate the number of moles of calcium hydroxide as follows.
No. of moles of =
=
= 30 mmol
Similarly, calculate the number of moles of HBr as follows.
No. of moles of HBr =
=
= 30 mmol
This means that the limiting reactant is HBr.
So, no. of moles of =
= 15 mmol
Hence, calculate the amount of heat released as follows.
Heat released in the reaction(q) =
as, m = mass of solution
and, Density =
or, mass = Density × Volume
= 1.08 g/ml \times (50 + 50) ml
= 108 g
where, s = specific heat of solution = 4.18 j/g.k
and, change in temperature =
=
Hence, the heat released will be as follows.
q =
q =
= 1354.32 joule
or, = 1.354 kJ (as 1 kJ = 1000 J)
Also, =
=
= -90.267 kJ/mol
Thus, we can conclude that the enthalpy change for the given reaction is -90.267 kJ/mol.
Answer : Both solutions contain molecules.
Explanation : The number of molecules of 0.5 M of sucrose is equal to the number of molecules in 0.5 M of glucose. Both solutions contain molecules.
Avogadro's Number is =
which represents particles per mole and particles may be typically molecules, atoms, ions, electrons, etc.
Here, only molarity values are given; where molarity is a measurement of concentration in terms of moles of the solute per liter of solvent.
Since each substance has the same concentration, 0.5 M, each will have the same number of molecules present per liter of solution.
Addition of molar mass for individual substance is not needed. As if both are considered in 1 Liter they would have same moles which is 0.5.
We can calculate the number of molecules for each;
Number of molecules = ;
∴ Number of molecules = which will be =
Thus, these solutions compare to each other in that they have not only the same concentration, but they will have the same number of solvated sugar molecules. But the mass of glucose dissolved will be less than the mass of sucrose.