Which law states that at constant temperature the pressure of a given amount of gas is inversely proportional to the volume of the gas?

He observed that volume of a given mass of a gas is inversely proportional to itspressure provided the temperature remains constant. Boyle's law, published in 1662,states that, at constant temperature, the product of the pressure and volume of agiven mass of an ideal gas in a closed system is always constant.

B.) falsehope this !

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.