Answer:
Enthalpy Change when 1 mole CaCl₂ dissolves
= - 81.13 kj/mole
Explanation:
Given information
Mass of CaCl₂ = 23.6 g
Temperature changes from 25.0°C to 38.7°C
Heat capacity of solution & calorimeter (C) = 1258 J/°C
We know Q = C x ΔT
⇒ Heat released = 1258 x (38.7 - 25)
= 1.7234 x 10⁴ J
= 17.2 Kilo-joule
Thus 23.6 g is equivalent to 1.7234 x 10⁴ J or 17.2 Kilo-joule of heat energy
Molar mass of calcium chloride (110.98)
Enthalpy Change when 1 mole CaCl₂ dissolves
=
<u>Answer:</u> The final temperature of the coffee is 43.9°C
<u>Explanation:</u>
To calculate the final temperature, we use the equation:
where,
q = heat released =
m = mass of water = 10.0 grams
C = specific heat capacity of water = 4.184 J/g°C
= final temperature = ?
= initial temperature = 20°C
Putting values in above equation, we get:
Hence, the final temperature of the coffee is 43.9°C
Answer:
percentage dissociation of trimethylacetic acid in a 0.57M aqueous solution = 0.40%
Explanation:
check attachment below for more information o the answer.
The answer is 33.2 moles of a solute is present in 4.00 L of an 8.30 M solution , Option A is correct .
<h3>What is Molarity ?</h3>Molarity is defined as the amount of solute (in moles)in per litre of solution.
It is also known as molar concentration of a solution , It is expressed in mol/l
We can rearrange this equation to get the number of moles:
n= M * V
The molarity of solution is 8.3 M and the volume given is 4 litres
the moles will be n = 8.30 * 4 = 33.2 moles
Therefore 33.2 moles of a solute is present in 4.00 L of an 8.30 M solution , Option A is correct .
To know more about molarity
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