Q. Suppose the elements A and B combine to form two compound AB and A2B. When 0.1 mole of AB weighs 20 g and 0.5 mole of A2B weighs 125 g. The atomic weight of A and B respectively are
(a) 100 and 150
(b) 75 and 50
(c) 50 and 150
(d) 80 and 140
Best one will be marked as brainlist
Answers
Answered by
8
Answer:
moles=
molarmass
mass
then, molarmass=
moles
mass
B
2
A
3
molar mass =90.05=180
relative formula mass of B
2
A
3
=180
that means,
(atomic mass of A) ×3+ (atomic mass of B) 2=180
3A+2B=180.....(i)
B
2
A molar mass =
0.1
10
=100u
2B+A=100.....(ii)
from equation (i) and (ii)
A=40
B=30
Hence, the correct option is B
Answered by
2
Step-by-step explanation:
moles=
molarmass
mass
then, molarmass=
moles
mass
B
2
A
3
molar mass =90.05=180
relative formula mass of B
2
A
3
=180
that means,
(atomic mass of A) ×3+ (atomic mass of B) 2=180
3A+2B=180.....(i)
B
2
A molar mass =
0.1
10
=100u
2B+A=100.....(ii)
from equation (i) and (ii)
A=40
B=30
Hence, the correct option is B
Similar questions