400cm³ of oxygen gas at 30degree Celsius bis heated at constant pressure to a temperature of 70 degree celsius. find the new volume of oxygen​

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

→

it means there are 3 atoms of oxygen

the correct answer would be d. hope this !