Answer:
The heat of reaction is 4938 kJ/mole
Explanation:
It is possible to calculate the heat of a reaction using:
![q = SpecificHeat *dT](https://tex.z-dn.net/?f=q%20%3D%20SpecificHeat%20%2AdT)
For the reaction:
C₁₂H₂₂O₁₁ (s) + 12 O₂ (g) → 12 CO₂ (g) + 11 H₂O (l)
Specific heat: 7,50kJ/°C
dT = 20,2°C
Thus, q = 151,5 kJ
The moles of sucrose are: 10,5g /342,2965 g/mol = 0,030675 moles
The heat of reacton is:
![\frac{151,5 kJ}{0,030675moles} = 4938 kJ/mol](https://tex.z-dn.net/?f=%5Cfrac%7B151%2C5%20kJ%7D%7B0%2C030675moles%7D%20%3D%204938%20kJ%2Fmol)
I hope it helps!
Answer:
D Earth's hot interior
Explanation:
The internal heat engine of the earth is the energy source that powers plate movement.
The sun drives the surface process and provides energy for the external heat engine
- The earth's interior sources it heat from:
- decays of radioactive isotopes
- remnant heat from the formation of the earth
- frictional heating from the movement of the earth
Therefore, the heat is used to melt rocks and set up convection currents that drives plate movements.
1.) when components are needed to be used in different ways
2.) sublimation, filtration, evaporation, and distillation
Answer:
Option 2:
The warmth of the spoon is conducted to the ice cream making it easier to scoop out.
Explanation:
Conduction refers to the transfer of heat from a hotter body to a cooler one, by virtue of physical contact between the two bodies. This is opposed to radiation, where there does not need to be any contact between the two bodies before heat con flow.
The warm spoon, once it has physical contact with the cool ice cream, it loses some of its heat to the ice cream, warming it up, making it easier to scoop up.
Answer:
C. CH₄+2O₂ →2H₂O+CO₂
Explanation:
This is a popular combustion reaction.
C. CH₄+2O₂ →2H₂O+CO₂
In combustion, hydrocarbons burn in the presence of oxygen gas and they produce water and carbon dioxide only. The process is accompanied with the release of energy.
We simply say for the above reaction that:
One molecule of methane(CH₄) reacts with two molecules of oxygen gas(O₂) to produce two molecules of water(H₂O) and one molecule of carbon dioxide only