How many grams of potassium chloride must decompose to produce 69.9 milliliters of potassium metal, if the density of potassium is 1.78 g/ml? show all steps of your calculation as well as the final answer.

Explanation:

It is known that density is mass divided by volume of a substance.

Mathematically,        Density =

Since, it is given that volume is 69.9 mL and density is 1.78 g/mL.

Hence, calculate the mass as follows.

            Density =

               1.78 g/mL =

                 mass = 124.42 g

Thus, we can conclude that mass of potassium chloride is 124.42 g.

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.

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the answer is a and have a great day