Answer:
Q = 1.5 kJ
Explanation:
It is given that,
The specific heat for aluminum is 0.900 J/g°C
Mass of sample, m = 3.8 g
Initial temperature,
Final temperature,
We need to find the heat released. The amount of heat released is given by the formula:
or
So, the correct option is (A) i.e. 1.5 kJ.
Temperature is directly proportional to the average kinetic energy of the molecules.
KE = 3/2 kT ...... where KE is the average kinetic energy of a molecule and k is Boltzmann's constant (1.381x10^-23 J/K).
KE = 3/2 RT ...... where KE is the average kinetic energy for a mole of molecules and R is the gas constant (8.314 J/molK).
Therefore, as KE decreases, T decreases and it gets cooler.
It gets cooler...as metal gains energy it becomes hotter and melts...
**The correct answer is C
Answer:
The mass of silver carbonate precipitated is 5.18 grams.
Explanation:
Molarity of the silver nitrate solution = 0.671 M
Volume of the silver nitrate solution = 56.0 mL
Moles of silver nitrate = n
Moles of silver nitrate used = 0.0376 mol
According to the reaction, 2 moles of silver nitrate gives 1 mole of silver carbonate, then 0.0376 moles of silver nitrate:
Moles of the silver carbonate formed = 0.0188 mol
Molar mass of silver carbonate = 275.7453 g/mol
Mass of silver carbonate :
The mass of silver carbonate precipitated is 5.18 grams.
Enthalpy is the energy needed for the phase change called vaporization. It is the energy needed to break the bonds of the liquid molecules so that it can be converted to its gaseous form. Therefore, the greater the value of the enthalpy is, the stronger are the bonds of the substance. <em>Therefore, the answer is Aluminum.</em>