All categories

1 year ago

Use the atomic mass of indium to calculate the relative abundance of indium-113.

Chemistry

1 answer:

ASHA 777 [7]1 year ago

7 0

The relative abundance of indium-113 is 4%.

The isotopes are species of the same element having the same atomic number but a different mass number.

The elements occurring in nature exist as multiple isotopes.

When we take into account the existence of these isotopes and their relative abundance (percent), the average atomic mass of that element can be computed, which is given by the following formula,

Average atomic Mass= (%age of isotope 1) x (Mass of isotope 1) + (%age of isotope 2) x (Mass of isotope 2)/100

Indium exists in the form of Indium-113 and Indium-115.

The mass of Indium-113 is 112.90 u.

The mass of Indium-115 is 114.90 u.

The average atomic mass of Indium is 114.82 u.

Let the %age of isotope 1(Indium-113) be X.

Then, the %age of isotope 2(Indium-115) would be 100-X.

Applying the values in the formula,

Average atomic mass = 112.90X+114.90(100-X)

114.82 = 112.90X+114.90(100-X)

On solving the above equation, the value of X comes out to be 4%.

Thus, the relative abundance/%age abundance of Indium-113 is 4%.

To know more about "Average Atomic Mass", refer to the following link:

brainly.com/question/13753702?referrer=searchResults

#SPJ4

You might be interested in

Which is the following will have the highest vapor pressure

Alexus [3.1K]

There is no list, but possibly evaporation.

8 0

3 years ago

Nicotine, a component of tobacco, is composed of c, h, and n. A 2.625-mg sample of nicotine was combusted, producing 7.1210 mg o

Vikki [24]

The mass sample of nicotine combusted = 2.625 mg (given)

Mass of $CO_2$ produced = 7.1210 mg (given)

Mass of $H_2O$ produced = 2.042 mg (given)

Molar mass of $CO_2$ = 44 g/mol

Molar mass of $H_2O$ = 18 g/mol

Percentage of Carbon = $\frac{12 g}{44 g/mol}\times \frac{7.120 mg of CO_2}{2.625 mg sample}\times 100 = 74.04$ %

Percentage of hydrogen = $\frac{2 g}{18 g/mol}\times \frac{2.04 mg of H_2O}{2.625 mg sample}\times 100 = 8.62$ %

Now, for percentage of nitrogen = $100 - (74.04+8.62) = 17.34$ %

Calculating the moles of each element:

$Number of moles = \frac{given mass}{Molar mass}$

For $C$

$\frac{74.04 g}{12 g/mol} = 6.17 mol$

For $H$

$\frac{8.62 g}{1 g/mol} = 8.62 mol$

For $N$

$\frac{17.34 g}{14 g/mol} = 1.24 mol$

Dividing with the smallest mole value to calculate the molar ratio of each element:

$C_{\frac{6.17}{1.24}} = C_{4.9} = C_5$

$H_{\frac{8.62}{1.24}} = H_{6.9} = H_7$

$N_{\frac{1.24}{1.24}} = N_1$

Hence, the empirical formula for nicotine is $C_5H_7N$ .

8 0

3 years ago

What is chemical formula for: Iron (III) fluoride

True [87]

Answer:

FeF3

Explanation:

You have to break this problems down and know the naming rules.

- symbol for iron - Fe

- symbol for fluoride - F

- Add together - FeF

- Now, add the 3

- FeF3

- Hope that helps! Please let me know if you need further explanation.

6 0

3 years ago

Which is not a characteristic of minerals

dem82 [27]

I think d is wrong because Everything else is correct for sure. also, minerals vary in the position they hold and have different chemical compounds.

6 0

3 years ago

Indicate the direction of polarity of each of the following covalent bonds by dragging the appropriate delta notation to each en

Damm [24]

Answer:

Polarity is a property of molecules that represents the separation of electrical charges within the molecule, depending on the number and type of bonds it possesses.

The covalent bond between two atoms can be polar or apolar. This depends on the type of atoms that make it up: if the atoms are equal, the bond will be apolar (since no atom attracts electrons more strongly). But, if the atoms are different, the bond will be polarized towards the most electronegative atom, since it will be the one that attracts the electron pair with more force.

For each of the followings covalent bonds the direction of polarity is the one shown in the picture.

We see that in the C-O bond oxygen is more electronegative than carbon. Therefore, there will be a dipole vector oriented towards of the oxygen. We can represent this polarization of the bond by means of an arrow, which always points to the most electronegative atom.

Explanation:

The polarity of a chemical bond occurs when there is an asymmetric distribution of the electronic cloud of the bond around the two atoms that make up that link. This happens when both atoms have different electronegativity.

Each bond composed of different atoms generates a dipole vector, which points to the most electronegative atom.
A molecule will have as many vectors as it has covalent bonds.
If the vectors do not cancel out, then the molecule will be polar.

7 0

4 years ago