Temperature is a measure of the energy of moving particles, so if the average kinetic energy is increasing, then the temperature would increase as well.
Answer:
B - The energy of reactants is conserved.
D - the nuclei of atoms changes completely ( if that's the option)
Answer:
a. Al2S3.
Explanation:
Molar mass of Al = 26.98
Molar mass of S = 32.06.
Ratio of AL:S is 1 : 1.78
Dividing by the moles we get:
0.0371 : 0.0555
= 1 : 1.5
So its Al2S3.
Answer:
2.5 mole of O2
Explanation:
From the equation we see that we need 5 molecules of oxygen to react with 2 molecules of C2H2.
This means that 5 moles of oxygen molecules are needed to completely react with 2 moles of C2H2, because a mole is a unit of particle count.
From that we can infer that to react with 1 mole of C2H2 we need half of 5 moles of oxygen - so 2.5 mole of oxygen molecules.
Answer:
The final temperature of the solution in the calorimeter is 28,7°C
Explanation:
A -ΔH means that when you dissolve CaCl₂ you will produce heat. This heat you produce is:
3,3g CaCl₂×
×82800J/mol = 2462,1 J
The specific heat capacity of solution is:
q = c×m×ΔT
Where q is energy: (2462,1J)
c is heat capacity of the solution (4,18J/g°C)
m is mass of solution (103,3g)
And ΔT is (T-23°C)
Solving for T:
T = 28,7°C
I hope it helps!
