At -200C, the matter exists as a gas. How many times the matter will change its state when the gas is heated from -100C to 1200C? (A)Once at 1000C (B)Twice, one at 00C and another at 1000C (C)Thrice, one at -100C, second at 00C and third at 1000C (D)None
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When 2 grams of a gas A is introduced in an evacuated flask kept at 25
o
C; the pressure was found to be 1 atm .i.e.
Partial Pressure of gas A = 1 atm.
And let moles be n
A
=
M
A
2
if 3 g of another gas B is then added to the same flask;
Partial Pressure of gas B = 1.5 atm – 1 atm. = 0.5 atm
moles of gas B =
M
B
3
Again the temp and volume are constant therefore,
n
1
P
1
=
n
2
P
2
Hence,
M
A
2
1
=
M
B
3
0.5
M
A
=
3
0.5M
B
×2
1
M
A
=
3
M
B
M
A
=
3
M
B
or
M
B
M
A
=
3
1
⇒1:3
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