that's instrument picture there is an manometer
Answer:
Explanation:
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In this case, for this calorimetry problem, it is possible for us to infer that the heat of the reaction of dissolution of KNO3 is absorbed by the solution composed by the former and water so that we can write:
Thus, given the mass, specific heat and temperature of the solution, we plug in the data to obtain the heat absorbed, by the reaction:
Also, we can say the the heat released by the solution was -3219.25 J.
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Answer:
the packing efficiency is 52.36%
Explanation:
Given the data in the question;
simple cubic unit cell that contains one atom with a metallic radius of 175 pm;
we know that;
Edge length of Simple cubic (a) is related to radius of atom (r) as follows;
a = 2r
since radius r = 175 pm
we substitute
a = 2 × 175 pm
a = 350 pm
Now we get the volume unit;
Volume of unit cell = a³ = ( 350 pm ) = 42875000 pm³
Next we get Volume of sphere;
Volume of Sphere = πr³
Volume occupied by 1 atom = × π × ( 175 pm )³
= × π × 5359375 pm³
= 22449297.5 pm³
Now, the packing efficiency = ( Volume occupied by 1 atom / Volume of unit cell ) × 100
we substitute;
packing efficiency = ( 22449297.5 pm³ / 42875000 pm³ ) × 100
= 0.523598 × 100
= 52.36%
Therefore, the packing efficiency is 52.36%
Answer:
71%
Explanation:
Theoretical Yield = 24
Actual Yield = 17
(Actual Yield/Theoretical Yield)*100% = (17/24)*100% ≈ 71%
Answer:
B
Explanation:
Condensation happens when there is a drop in temperature. As the heat decreases, the speed that molecules move also decreases. Furthermore, as a gas turns into a liquid, the molecules become more packed together, making the volume decrease, and the shape to become more defined.