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!
Solar and nuclear hope this helped
Answer:
13.5%
Explanation:
To answer this you need to understand that percentage error can never be negative as we use absolute value in the equation
To get molar/atomic mass = mass/moles
=0.3681g/(6.514×10^-3)moles
=56.509g/moles
percentage error = (65.38-56.509)/65.38 ×100
=13.56% (this is what I'm getting without rounding off your question wasn't specific on how many d.p to use)
Water (H2O) can be called a molecule or a compound because it is made of hydrogen (H) and oxygen (O)
Answer:
Catalyst is a substance that increases the rate of a chemical reaction but is chemically unchanged at the end of the reaction.
properties of catalyst :
1. A catalyst increases the speed of a reaction, and it also improves the yield of the intended product.
2. A catalyst actually takes part in the reaction even though it itself is not consumed or used up in the course of the reaction.
3. A catalyst makes the reaction faster by providing an alternative pathway with a lower activation energy.
4. A catalyst is reaction-specific. It may not be effective in another reaction even if the two reactions are of similar type.
5. In a reversible reaction, a catalyst accelerates both the forward and the reverse reactions. So, the inclusion of a catalyst does not alter the equilibrium constant of a reversible reaction.