Which of the following statements correctly describes the relationship between pressure (p) and volume (v) illustrated in the following plot for a gas at constant temperature?

Utilize the formula pV=nRT This is the ideal gas law which is what boyles, law Charles law, and gay Lussac's laws are based off of. To use this formula, we must keep one variable constant in order to study the relationship between the other two. So what we must do is, say pressure and temperature are constant. The formula becomes V = nR But we must also consider what this means: from my understanding, R = the gas constant which drops out of our equation, so V = n. I feel that this shows us that the volume = number of moles of gas. If I am correct.

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.

The answer to your q it is d