A 100g sample of Carbon-14 has a half-life of 5 years. How much Carbon-14 is left after 10 years?

The amount of carbon-14 left after 10 years is 25 g

Explanation:

Formula used :

where,

a = amount of reactant left after n-half lives = ?

= Initial amount of the reactant = 100 g

n = number of half lives =

Putting values in above equation, we get:

Therefore, the amount of carbon-14 left after 10 years is 25 g

the increase of protons   hope this

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.