Isotonic solution- refers to two solutions having the same osmotic pressure across a semipermeable membrane
Answer:
3
Explanation:
102 are significant figures
Are you asking for a specific atom or just the general definition?
The general definition of alpha decay is the loss of two protons and two neutrons from a nucleus. (Also equal to a helium atom!) This decreases the total mass number by 4 and the atomic number by 2.
The question is incomplete, here is the complete question:
At 20°C the vapor pressure of benzene is 75 torr, and that of toluene is 22 torr. Assume that benzene and toluene form an ideal solution.
What is the mole fraction of benzene in the solution that has a vapor pressure of 38 torr at 20°C? Express your answer using two significant figures.
<u>Answer:</u> The mole fraction of benzene is 0.302
<u>Explanation:</u>
Let the mole fraction of benzene be 'x' and that of toluene is '1-x'
To calculate the total pressure of the mixture of the gases, we use the equation given by Raoult's law, which is:
We are given:
Vapor pressure of benzene = 75 torr
Vapor pressure of toluene = 22 torr
Vapor pressure of solution = 38 torr
Putting values in above equation, we get:
Hence, the mole fraction of benzene is 0.30
Completed Question:
The decomposition of sulfuryl chloride, SO2Cl2, to sulfur dioxide and chlorine gases is a first order reaction. IT is found taht it takes 13.7 hours to decompose a 0.250 M SO2Cl2 solution to 0.117 M. What is the rate constant for the decomposition?
Answer:
0.04 h⁻¹
Explanation:
If the decomposition occurs at a first-order reaction, it means that the rate of the reaction can be expressed as:
rate = k*[SO2Cl2]
Where k is the rate constant, and [SO2Cl2] is the initial concentration of SO2Cl2. The rate is also the variation of the concentration by the time, so it is:
rate = (0.250 - 0.117)/13.7
rate = 0.0098 M/h
Thus, the concnetration decays 0.0098 M for each hour. The rate constant is then:
0.0098 = k*0.250
k = 0.04 h⁻¹