Physical Chemistry> Suppose A and B form 2 compounds B2A3 and...

Suppose A and B form 2 compounds B2A3 and B2A. If 0.05 mole ofB2A3 weighs 9 g and 0.1 mole ofB2A weighs 10 g, the atomic weight of A and B are

Suvashree Dinda , 8 Years ago

Grade 11

3 Answers

Vikas TU

Last Activity: 8 Years ago

molar mass of B2A3 = 9/0.05 = 900/5

=>180 = 2B + 3A ….....................................(1)

molar mass of B2A = 10/0.1 = 100

=> 100 = 2B + A …...........................................(2)

solve the eqns. (1) and (2)

2A = 80

A = 40

B = 30

Vamshee krishna

Last Activity: 6 Years ago

let mass of B2A3 be x

as we know no of moles(n) = given mass / mass of compound

0.05 = 9g / x

x = 9 / 0.05 = 180g

mass of B2A3 is 180g

now,

let mass of B2A be y

0.1 = 10 / y

y = 10 / 0.1 = 100g

so, mass of B2A is 100g.

now 3B+2A=180

B+2A=100

Solving both the eqations we get 2B = 80 and B=40

substituting the value of B in any equation we get A=30

Rishi Sharma

Last Activity: 4 Years ago

Dear Students,
Please find below the solution to above problem.
Let mass of B2A3 be x
As we know no of moles(n) = given mass / mass of compound
0.05 = 9g / x
x = 9 / 0.05 = 180g
mass of B2A3 is 180g
now,
let mass of B2A bey
0.1 = 10 / y
y = 10 / 0.1 = 100g
so, mass of B2A is 100g.
now 3B+2A=180
B+2A=100
Solving both the eqations we get 2B = 80 and B=40
substituting the value of B in any equation we get A=30

Thanks and Regards