-25.116 Kilojoules are given off when 120 grams of water are cooled from 25°C to -25°C.
Explanation:
GIVEN THAT:
mass of water = 120 grams OR 0.12 Kg
initial temperature = 25 degrees
final temperature = -25degrees
change in temperature (ΔT) = final temperature - initial temperature
-25 -25
= -50 degrees
specific heat capacity of water = 4.186 joule/gram degree Celsius
Q (heat energy transferred) = ?
Formula used,
Q = mcΔT
Putting the values in equation
Q = 120 X 4.186 X -50
= -25116 joules
The energy in joules is converted to kilo joule by dividing it with 1000.
The negative sign in the energy transfer shows that energy is released in the process.
If you sketch a Lewis dot structure of I3-, you'll perceive
that the center I atom formulates two bonds, and also has three non-bonding
pairs of electrons. That's an over-all of five electron pairs - beyond an
octet. Lots of compounds disrupt the octet rule that means, but the first long-row
elements like F can't because the lower elements like iodine can use an obtainable
d-orbital to house the additional pair of electrons (sp3d hybridization), but F
just doesn't have a d-orbital that it can use.
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For #2: Odor, Temperature, and color
Molality of the solution is defined as the number of moles of a substance dissolved divided by the mass of the solvent:
Molality = number of moles / solvent mass
From the concentration of 39% (by mass) of HCl in water, we construct the following reasoning:
in 100 g solution we have 39 g hydrochloric acid (HCl)
number of moles = mass / molecular weight
number of moles of HCl = 39 / 36.5 = 1.07 moles
solvent (water) mass = solution mass - hydrochloric acid mass
solvent (water) mass = 100 - 39 = 61 g
Now we can determine the molality:
molality = 1.07 moles / 61 g = 0.018
Answer:
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Explanation:
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