Answer:
Concentration = 1.32 m
Boiling point = 
Explanation:
Let the boiling point of two solutions = T
Let the molal concentration of the two solutions= m
The relation between elevation in boiling point and molal concentration is:

i) For benzene

....(1)
ii) For carbon tetrachloride

...(2)
Equating the two equations:

Putting value of "m" in equation "1"

<u>Answer:</u> The new pressure will be 101.46 kPa.
<u>Explanation:</u>
To calculate the new pressure, we use the equation given by Gay-Lussac Law. This law states that pressure is directly proportional to the temperature of the gas at constant volume.
The equation given by this law is:

where,
are initial pressure and temperature.
are final pressure and temperature.
We are given:
By using conversion factor: 

Putting values in above equation, we get:

Hence, the new pressure will be 101.46 kPa.
Hihi!
The correct answer is B. The mass number of this nuclide is 131! It's proton number is 56 and it has 75 neutrons (131 - 56 = 75 neutrons).
I hope I helped!
-Jailbaitasmr