Ascuba diver’s air tank contains oxygen, helium, and nitrogen at a total pressure of 205 atmospheres. the partial pressure of nitrogen is 143 atmospheres, and the partial pressure of helium is 41 atmospheres. what is the partial pressure of oxygen in the tank? a. 21 atm b. 103 atm c. 307 atm d. 389 atm

A. 21 atm

Explanation: According to Dalton's law of partial pressure, the total pressure of a gas mixture is the sum of partial pressures of individual gases.

Thus

Given: = 205 atm

= 41 atm

= 143 atm

Thus

the correct answer is boyle

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6