The <span>Kinetic Theory of Matter.
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It is a physical change, the reason being is that it only changes a physical property it does not change the molecular composition.
Answer : The concentration of [CoCl₄]²⁻ is,
Explanation :
Using Beer-Lambert's law :
where,
A = absorbance of solution = 0.935
C = concentration of solution = ?
l = path length = 0.71 cm
= molar absorptivity coefficient =
Now put all the given values in the above formula, we get:
Therefore, the concentration of [CoCl₄]²⁻ is,
<h3>
Answer:</h3>
= 19.712 kJoules
<h3>
Explanation:</h3>
- Heat of vaporization refers to the amount of heat required to change a unit mass of a substance from liquid to gaseous state without change in temperature.
To calculate the amount of heat, we use,
Amount of heat = Mass × Heat of vaporization
Q = m×Lv
Given;
Mass of liquid Zinc = 11.2 g
Lv of liquid Zinc = 1.76 kJ/g
Therefore;
Q = 11.2 g × 1.76 kJ/g
= 19.712 kJ
Thus, the amount of heat needed to boil 11.2 g of zinc is 19.712 kilo-joules.