NooooOoOOOOOɪᴏᴏɪᴡᴏᴏɪʀᴇᴡʜʜʙᴠᴇᴠᴅᴊʜʙsʙʙsʙʙᴊᴊᴊᴊʀvesebhreeje
Answer:
Caesium (55Cs) has 40 known isotopes, making it, along with barium and mercury, one of the elements with the most isotopes. The atomic masses of these isotopes range from 112 to 151. Only one isotope, 133Cs, is stable. The longest-lived radioisotopes are 135Cs with a half-life of 2.3 million years, ... It constitutes most of the radioactivity still left from the Chernobyl accident ...
Answer:
i am new but I haven't reached this level yet
<u>Answer:</u> The partial pressure of helium gas is 0.80 atm
<u>Explanation:</u>
Dalton's law of partial pressure states that the total pressure of the system is equal to the sum of partial pressure of each component present in it.
To calculate the partial pressure of helium gas, we use the law given by Dalton, which is:

We are given:
Total pressure of the cylinder,
= 1.00 atm
Vapor pressure of oxygen gas,
= 0.20 atm
Putting values in above equation, we get:

Hence, the partial pressure of helium gas is 0.80 atm