Answer:
a)
b)
c)
d)
Explanation:
The reaction is:
Cr₂O₃(s) + 2Al(s) → 2Cr(s) + Al₂O₃(s)
a) To find the Al mass needed to react with 50 g of Cr₂O₃, we need to calculate the number of moles of Cr₂O₃:
Where:
: is the mass = 50 g
: is the molar mass = 2*52+3*16 = 152 g/mol
Now, the estoichiometric relation between Cr₂O₃ and Al is 1:2, so:
Hence, the mass of Al is:
b) The stoichiometric relation from Cr₂O₃ and Cr is 1:2, hence:
Thus, the mass of Cr is:
c) The number of moles of Cr₂O₃ with a mass of 5 kg is:
So, the mass of Cr is:
d) The mass of Cr produced from 5 tonnes of Cr₂O₃ is:
I hope it helps you!
Answer:
Both oceanic crust and continental crust are less dense than the mantle, but oceanic crust is denser than continental crust. ... Because continental crust is less dense than oceanic crust it floats higher on the mantle, just like a piece of Styrofoam floats higher on the water than a piece of wood does
Answer:
The total number of molecules remains the same
Answer: The total kinetic energy of all the particles is called the thermal energy or thermal kinetic energy of the object. This is opposed to the kinetic energy of the whole object (like a moving object) and the kinetic energy of a single particle. However, the particles also have their own potential energy.