14. A sample that originally contained 2.5 g of rubidium-87 now contains 1.25 g. The half-life of rubidium-87 is 6 x 10^10 years. How old is the sample? Is this possible? Why or why not?

The age of the sample is . It is possible, since the definition of half-life is the time taken by the isotope to halve its mass.

Explanation:

All radioactive isotopes decays exponentially, the decay is represented by the following formula:

(1)

Where:

- Initial mass of the isotope, measured in grams.

- Current mass of the isotope, measured in grams.

- Time, measured in years.

- Time constant, measured in years.

Now we clear the time of the isotope within the formula:

In addtion, the time constant can be calculated in terms of the half-life (), measured in years:

(2)

If we know that , and , then the age of the isotope is:

The age of the sample is . It is possible, since the definition of half-life is the time taken by the isotope to halve its mass.

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.