Answer:
180 p
Explanation:
Energy refers to the capacity of doing work.
Amount charged by an electrical company = 15 p per unit of energy (kWh)
As 1 W = 1000 kW,
![500W=\frac{500}{1000}kW=0.5\,kW](https://tex.z-dn.net/?f=500W%3D%5Cfrac%7B500%7D%7B1000%7DkW%3D0.5%5C%2CkW)
Also, 1 day = 24 hours.
Cost of running a 500 W freezer = 0.5 kW freezer for 1 hour = ![15\times 0.5=7.5\,p](https://tex.z-dn.net/?f=15%5Ctimes%200.5%3D7.5%5C%2Cp)
Therefore,
cost of running a 0.5 kW freezer for a day ( 24 hours ) = ![7.5\times 24=180\,p](https://tex.z-dn.net/?f=7.5%5Ctimes%2024%3D180%5C%2Cp)
Amount charged by an electrical company = 15 p per unit of energy (kWh)
As 1 W = 1000 kW,
![500W=\frac{500}{1000}kW=0.5\,kW](https://tex.z-dn.net/?f=500W%3D%5Cfrac%7B500%7D%7B1000%7DkW%3D0.5%5C%2CkW)
Also, 1 day = 24 hours.
Cost of running a 500 W freezer = 0.5 kW freezer for 1 hour = ![15\times 0.5=7.5\,p](https://tex.z-dn.net/?f=15%5Ctimes%200.5%3D7.5%5C%2Cp)
Therefore,
cost of running a 0.5 kW freezer for a day ( 24 hours ) = ![7.5\times 24=180\,p](https://tex.z-dn.net/?f=7.5%5Ctimes%2024%3D180%5C%2Cp)
Answer:
![Q=50,849.25J\\\\Q=12,153.3cal](https://tex.z-dn.net/?f=Q%3D50%2C849.25J%5C%5C%5C%5CQ%3D12%2C153.3cal)
Explanation:
Hello!
In this case, given the mass, temperature change and specific heat, it is possible to compute the required heat in joules as shown below:
![Q=mC(T_2-T_1)\\\\Q=75.0g*0.449\frac{J}{g\°C}(1535\°C-25\°C)\\\\Q=50,849.25J](https://tex.z-dn.net/?f=Q%3DmC%28T_2-T_1%29%5C%5C%5C%5CQ%3D75.0g%2A0.449%5Cfrac%7BJ%7D%7Bg%5C%C2%B0C%7D%281535%5C%C2%B0C-25%5C%C2%B0C%29%5C%5C%5C%5CQ%3D50%2C849.25J)
Now, since 1 cal =4.184 J, this result in calories is:
![Q=50,849.25J*\frac{1cal}{4.184J}\\\\Q=12,153.3cal](https://tex.z-dn.net/?f=Q%3D50%2C849.25J%2A%5Cfrac%7B1cal%7D%7B4.184J%7D%5C%5C%5C%5CQ%3D12%2C153.3cal)
Best regards!
Molarity = (numer of mole solute) / (volume of the solution)
number of mole solute = mass solute/molar mass solute
Molarity =( mass solute/molar mass solute)/ (volume of the solution)=
= ( mass solute/((molar mass solute)*(volume of the solution))
If m is a mass of the solute, M is a molar mass a solute, V is a volume of the solution (we can think as a volume of water added).
Molarity = m/(M*V)
Because they do not have the same qualities therefore they are different
Answer:
Phosphorus
Explanation:
Lewis Dot Structure is a structural representation of a molecule that shows valence electrons of a molecule.
The element in group 15, period 3 is Phosphorus (P). Phosphorus has an atomic number 15 and valence electrons are 5. So, the lewis structure will show 5 dots around P atom.