Which property is dependent only on the atomic structure of the compound? *

Samarium-146 has a half-life of 103.5 million years. After 1.035 billion years, how much samarium-146 will remain from a 205-g s

BaLLatris [955]

Answer : The correct option is, 0.200 g

Solution :

As we know that the radioactive decays follow first order kinetics.

First we have to calculate the rate constant of a samarium-146.

Formula used :

$t_{1/2}=\frac{0.693}{k}$

Putting value of $t_{1/2}$ in this formula, we get the rate constant.

$103.5\times 10^6=\frac{0.693}{k}$

$k=6.6\times 10^{-9}year^{-1}$

Now we have to calculate the original amount of samarium-146.

The expression for rate law for first order kinetics is given by :

$k=\frac{2.303}{t}\log\frac{a}{a-x}$

where,

k = rate constant = $6.6\times 10^{-9}year^{-1}$

t = time taken for decay process = $1.035\times 10^{9}years$

a = initial amount of the samarium-146 = 205 g

a - x = amount left after decay process = ?

Putting values in above equation, we get the value of initial amount of samarium-146.

$6.6\times 10^{-9}=\frac{2.303}{1.035\times 10^{9}}\log\frac{205}{a-x}$

$a-x=0.200g$

Therefore, the amount left of the samarium-146 is, 0.200 g

4 0

4 years ago

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How is energy involved in physical change?

enyata [817]

Answer:

when solid dry ice vaporizes (physical change), carbon dioxide molecules absorb energy. When liquid water becomes ice, energy is released. Remember that all chemical reactions involve a change in the bonds of the reactants.

Explanation:

3 0

3 years ago

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Add one or more curved arrows to show the movement of electrons in the reaction. To draw the arrows, select More in the drawing

DIA [1.3K]

Answer:

H3C - O - O - CH -HCOCH2.

Explanation:

Before chemical reaction can occur, some steps has to be followed in order to give the final product (s), this steps can be shown by drawing the chemical compound and showing how bonds are being broken or formed. Showing this in a stepwise manner is known as reaction mechanism.

From the question above, it is given that the products after heating the reactant gives H3C—0. +.0—CH HCO CH2.

The starting material can be deduce as;

H3C - O - O - CH -HCOCH2.

Heat causes something to divide or melt. Kindly check the attached picture which shows how the deduced starting compound splits to give H3C—0. and .0—CH HCO CH2.

3 0

3 years ago

Two atoms that have the same number of protons must be the same__________.

bonufazy [111]

Answer:

Element

Explanation:

Two of the same element may have differing numbers of neutrons, however, when it comes to protons, two of the same element will always have the same number of protons. Two different elements may have the same neutrons, but never protons.

4 0

3 years ago

Why does silicon have a high melting point

Igoryamba

If the bonds are held together tightly, as an ionic bond or even a covalent bond, there will need to be a strong force to separate those bonds. This would by why their would be a high melting point. Another reason would be re-activity. <span />

7 0

3 years ago