When limestone (solid CaCO3) is heated, it decomposes into lime (solid CaO) and carbon dioxide gas. This is an extremely useful industrial process of great
antiquity, because powdered lime mixed with water is the basis for mortar and concrete - the lime absorbs Co, from the air and turns back into hard, durable
limestone.
Suppose a limekiln of volume 450. L is pressurized with carbon dioxide gas to 8.03 atm, and heated to 1000. °C. When the amount of CO, has stopped
changing, it is found that 1.29 kg of CaCO3 have appeared.
Calculate the pressure equilibrium constant K, this experiment suggests for the equilibrium between CaCO, and Cao at 1000. °C. Round your answer to 2
significant digits.
Note for advanced students: it's possible there was some error in this experiment, and the value it suggests for K, does not match the accepted value.

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.