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Answer:vapor
Explanation: Because it is
The answer would be 5.60 x 10^3
Using ideal gas equation,

Here,
P denotes pressure
V denotes volume
n denotes number of moles of gas
R denotes gas constant
T denotes temperature
The values at STP will be:
P=1 atm
T=25 C+273 K =298.15K
V=663 ml=0.663L
R=0.0821 atm L mol ⁻¹
Mass of gas given=1.25 g g
Molar mass of gas given=?


Putting all the values in the above equation,

Molar mass of the gas=46.15
Explanation:
Relation between temperature and activation energy according to Arrhenius equation is as follows.
k =
where, k = rate constant
A = pre-exponential factor
= activation energy
R = gas constant
T = temperature in kelvin
Also,

=
= (244 + 273) K = 517.15 K
=
= (597.15 + 273) K = 597.15 K
= 6.7
,
= ?
R = 8.314 J/mol K
= 71.0 kJ/mol = 71000 J/mol
Putting the given values into the above formula as follows.

= 2.2123
= 9.1364

Thus, we can conclude that rate constant of this reaction is
.