Question

calculate the mass of 10.5gm molecular of H2O
















​

Answer 1

Explanation:

As we know,

PV=nRT=

M

w

RT

or 1=

M

2.8

×0.0821×400

or M=91.95≈92

Let the formula be C a H b.

So 12a+b=92

b

12a

=10.5(given)

11.5b=92

or b=8

∴ a=7

Therefore, the formula is C 7

H 8.

molar mass = 12*7+1*8 = 92gm/mole

Answer 2

Answer:

calculate the mass of 10.5gm molecular of H2O = 92 .

Explanation:

As we know,

PV=nRT=

M

w

RT

or 1=

M

2.8

×0.0821×400

or M=91.95≈92

Let the formula be C

a

H

b

.

So 12a+b=92

b

12a

=10.5(given)

11.5b=92

or b=8

∴ a=7

Therefore, the formula is C

7

H

8

.

molar mass = 12*7+1*8 = 92gm/mole.

HOPE IT WILL HELP U TO UNDERSTAND.