sol:-
1):- data provided in the question is :-
moles of Fe = (molecules of Fe)/(molecules in 1mole)
= (2.21 * 1024)/(6.022 * 1023)
= 3.67 mole
reaction :-
Fe2O3 + CO 2Fe + 3CO2
2 mole of Fe produced from 1 mole of Fe2O3
3.67 mole of Fe will produced from (1/2)*3.67 of Fe2O3
= 1.835 mole of Fe2O3
mole of Fe2O3 = 1.835 moles
2):-data provided in the question is :-
reaction is :-
A + 2B + 3C 2D + E
from the reaction :-
2 mole of B react with 1 mole of A so,
0.60 mole of B will react with (1/2)*0.60 mole of A
= 0.30 mole of A
then,
2 mole of B react with 3 mole C so,
0.60 mole of B will react with (3/2)*0.60 mole of C
= 0.90 mole of C
amount of A require = 0.30 mole
amount of B require = 0.60 mole
amount of C require = 0.90 mole
so,
A is in excess amount( 0.50 - 0.30 = 0.20) and other reactant is in less amount . so,
limiting reagent = B and C
3):-sol:-
total mass of mixture of CH4 and C3H8 = 309 g
reaction :-
CH4 + 2O2 CO2 + 2H2O -(1)
C3H8 + 5O2 3CO2 + 4H2O -(2)
from reaction (1):-
16 g of CH4 produce 44 g of CO2 then,
134.724 g of CH4 produce (44/16)*134.724 g of CO2
= 370.491 g of CO2
from reaction (2):-
44 g of C3H8 produce (3*44) g of CO2 then,
174.276 g of C3H8 produce (3*44/44)*174.276 g of CO2
= 522.828 g of CO2
then total amount of CO2 = (370.491 + 522.828) g = 893.319
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