Answer:
0.693kg of CuFeS2 is needed to produce 240 grams of Cu.
Explanation:
In 1 mole of CuFeS2 is associated 1 mole of Cu.
Molar mass of CuFeS2 = 183.5 g/mol
Molar mass of Cu = 63.5g/mol
No of moles of copper present in 240g of chalcopyrite = 240/63.5 = 3.779moles
we know
1 mole of Cu → 1 mole of CuFeS2
in 3.779 moles of Cu → 3.779 moles of CuFeS2
3.779 moles of CuFeS2 = 3.779 * 183.5 = 693.45grams
CuFeS2 in kg = 0.693kg
Answer:
B). The equivalence point is where the amount of acid equals the amount of base during any add-base titration.
Explanation:
Equivalence point -
During the process of titration of the neutralization reaction , like acid - base reaction .
In the titration process , the equivalence point is the point , when the amount of acid is equal to the amount of base .
In indicator used for th process is pH sensitive ,
It is not always necessary to have pH = 7 at the equivalence point ,
The titration curve is plotted for the pH v/s base .
Hence , from the given options , the correct statement is ( B ) .
I would say it is A because it can be a group of atoms. idk
Answer:
True
Explanation:
Limiting reactant - the reactant which get completely consumed in a chemical reaction , is known as the limiting reactant .
As, the concentration of limiting reactant after the completion of the reaction will be zero , hence, it is used to determine the concentration of other reactants .
For example,
for a general reaction -
A + B ---> 3C
Assuming B to be the limiting reactant ,
hence, the concentration of C and A can be determined as -
1 mol of B can give 3 mol of C and 1 mol of A is used for the reaction.
