Answer:
The answer to the question is
The solution contains 4.73 % by mass of NaCl
Explanation:
To solve this we list out the variables thus
The Molarity of NaCl = 0.850 M,
Density of solution = 1.05 g/mL
Molar mass of NaCl = 58.44 g/mol
Therefore mass of NaCl in he solution = (58.44 g/mol) × (0.850 M) = 49.674 g of NaCl
However the density = 1.05 g/mL or 1050 g/L
Therefore the mass percent of NaCl in 1 liter of solution or 1050 g of solution = (49.674/1050) × 100 = 4.73 %
The concentration of NaCl in mass percent = 4.73 %
Answer:
7.71x10^23 molecules
Explanation:
Avogadro's # = 6.022x10^23
1.28 mol SiO2 x 6.022x10^23/ 1 mol SiO2 = 7.71x10^23 molecules
Average atomic mass of an element=Atomic mass isotope₁* percent abundance isotope₁ + Atomic mass isotope₂* percent abundance isotope₂+<span>Atomic mass isotope</span>₃<span>* percent abundance isotope</span>₃....
average atomic mass=39.96 u*0.9959+37.96 u*0.00065+
35.97 u*0.00366≈39.95 u
Answer: the average atomic mass of this element is 39.95 u
Answer:
0.000170 mol
Explanation:
This problem can be solved using dimensional analysis:
3.25g CuS × × = 0.000170 mol
Answer: The given reaction is non-spontaneous at low temperatures and spontaneous at high temperatures.
Explanation:
We know that relation between free energy and enthalpy is as follows.
As in the given drawing, solid is converting into gas. This means that there is occurring an increase in entropy of the system. This also means that the enthalpy change will also be positive.
Free energy change is negative (spontaneous) at high temperature and free energy change is positive at low temperature.
Hence, we can conclude that the given reaction is non-spontaneous at low temperatures and spontaneous at high temperatures.