Answer: The correct answer is option D.
Explanation:
Mass of the NaCl = 225 g
Volume of the solution ,V = 0.25 L
15.4004 mol/L is the molarity of the solution. The most closest option to our answer is option D.
100.0g x 4.184J/g/°C x 78°C ΔT = 32,645.2 Joules.
The molarity of a 27%(v/v) aqueous ethanol solution is 4.63 M
calculation
convert 27%(v/v) to fraction = 27ml/100 ml
use density to convert 27ml to grams = 27 ml x0.79 g/ml = 21.33 g
find the number of moles of C2H6O
moles = mass/molar mass of C2H6O(46.07 g/mol)
moles is therefore = 21.33 g /46.07 g/mol =0.463 moles
find the molarity = moles /volume in liters
volume in liter = 100 ml/1000 = 0.1 L
molarity is therefore = 0.463 mole/0.1 L = 4.63 M
Answer:
Recall from the 1st law of thermodynamic - Energy Balance gives;
assuming : there is no change in kinetic and potential energy, a steady state process, etc.
ΔU = ΔQ + ΔW
For this system, ΔW = +ve (engine does the work)
ΔU = -2952J
ΔQ = -ve? (Heat energy is been released)
Since the heat energy is removed, the internal energy must increase by
-2952J = 642J - ΔQ
ΔQ = (642 + 2952) = 3594 J was released from the engine and the amount that must be cooled off
Now to find the change in the internal energy of the engine?
Note that as as soon as the heat is removed, there would not be any change in the internal energy of the system because all the energy from the burning of the measure of fuel has been removed.
so ΔU = 0J
<em>PLATO ANSWERS: </em>
<u>A.</u> Which source of electricity generation caused the most emissions?
<u>B.</u> What types of industries are responsible for greenhouse gas emissions?
<u>C.</u> What caused the dip in greenhouse gas emissions in transportation after 2007?
<em>Hope I helped some, Have a great day!</em>