In astronomy, Kepler's laws of planet motion are three scientific laws describing the motion of planets around the Sun, published by Johannes Kepler between 1609 and 1619.
Answer:
The quantity of heat lost by the surroundings is 258,5J
Explanation:
The dissolution of salt XY is endothermic because the water temperature decreased.
The total heat consumed by the dissolution process is:
4,184 J/g°C × (75,0 + 1,50 g) × 0,93°C = 297,7 J
This heat is consumed by the calorimeter and by the surroundings.
The heat consumed by the calorimeter is:
42,2 J/°C × (0,93°C) = 39,2 J
That means that the quantity of heat lost by the surroundings is:
297,7J - 39,2J = <em>258,5 J</em>
I hope it helps!
Answer:
Second order
Explanation:
We could obtain the order of reaction by looking at the table very closely.
Now notice that in experiment 1 and 2, the concentration of [OH^-] was held constant while the concentration of [S8] was varied. So we have;
a situation in which the rate of reaction was tripled;
0.3/0.1 = 2.10/0.699
3^1 = 3^1
Therefore the order of reaction with respect to [S8] is 1.
For [OH^-], we have to look at experiment 2 and 3 where the concentration of [S8] was held constant;
x/0.01 = 4.19/2.10
x/0.01 = 2
x = 2 * 0.01
x = 0.02
So we have;
0.02/0.01 = 2^1
2^1 = 2^1
The order of reaction with respect to [OH^-] = 1
So we have the overall rate law as;
Rate = k[S8]^1 [OH^-] ^1
Overall order of reaction = 1 + 1 = 2
Therefore the reaction is second order.
The gram formula mass is Molar mass. The mass of 1.0 moles is :
3) 48.0 g
