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3 years ago

ANSWER: b i hope i helped

Chemistry

2 answers:

Sergio [31]3 years ago

7 0

Answer:

thanks

Explanation:

grandymaker [24]3 years ago

6 0

The answer is b I hope I helped

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How many protons (p), neutrons (n), and electrons (e) are in one atom of 23 12mg?

REY [17]

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3 years ago

The half-life of plutonium-241 is approximately 13 years. a. How much of a sample weighing 2 g will remain after 70 years? b.

Studentka2010 [4]

Answer: A) 0.0480 grams and B) 56.16 years.

Explanation: Half live is the time in which the amount of radioactive substance remains halve of its initial amount.

The formula we use for solving this type of problem is:

$\frac{N}{N_0}=(\frac{1}{2})^n$

where, $N_0$ is the initial amount and N is the remaining amount of radioactive substance and n is the number of half lives.

$n=T/t_1_/_2$

where, T is the time and $t_1_/_2$ is half life.

A) from given data, $N_0$ = 2 g

T = 70 years

$t_1_/_2$ = 13 years

N= ?

$n=\frac{70years}{13years}$

n = 5.38

$\frac{N}{2g}=(\frac{1}{2})^5^.^3^8$

$\frac{N}{2g}=0.0240$

N = 0.0480 g

So, 0.0480 grams of the substance will be remaining after 70 years.

B) $N_0$ = 2 g

N = 0.1 g

T = ?

Let's first calculate the value of n for this.

$\frac{0.1}{2}=(\frac{1}{2})^n$

$0.05=0.5^n$

Taking log to both sides:

$log0.05=nlog0.5$

$-1.301=n(-0.3010)$

$n=\frac{1.3010}{0.3010}$

n = 4.32

Half life is 13 years, so we can calculate the time as:

$n=T/t_1_/_2$

$T=n*t_1_/_2$

$T=4.32*13years$

T = 56.16 years

So, it will take 56.16 years for the radioactive substance to decay from 2 g to 0.1 g.

8 0

4 years ago

Read 2 more answers

Why do atoms always contain the same number of electrons and protons?

katovenus [111]

Answer:

An electron is a negatively charged subatomic particle and a proton is a positively charged subatomic particle. Positive charge(s) attract negative charge(s) and vice versa. The proton and neutron stay together and attract one another to give the atom an overall charge of zero (neutral). Which is the charge of an atom. When there is an unequal number of protons and neutrons an ion is formed. If the number of protons are more than the electron, a positively charged ion called cation is formed. On the other hand, if the number of electrons are more than the protons a negatively charged ion called anion is formed.

8 0

4 years ago

Read 2 more answers

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nekit [7.7K]

<u>Answer:</u> The correct option is C) 1.68 mol/L

<u>Explanation:</u>

Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:

$\text{Molarity of solution}=\frac{\text{Given mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution (L)}}$ .....(1)