How is carbon the element used

Average atomic masses listed by IUPAC are based on a study of experimental results. Bromine has two isotopes 73 br and81 br, who

ddd [48]

Answer: The average atomic mass of element bromine is 80.4104 amu.

Explanation:

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ .....(1)

For _{35}^{79}\textrm{Br}[/tex] isotope:

Mass of $_{35}^{79}\textrm{Br}$ isotope = 78.9183 amu

Percentage abundance of $_{35}^{79}\textrm{Br}$ isotope = 50.69 %

Fractional abundance of $_{35}^{79}\textrm{Br}$ isotope = 0.5069

For $_{35}^{81}\textrm{Br}$ isotope:

Mass of $_{35}^{81}\textrm{Br}$ isotope = 80.9163 amu

Percentage abundance of $_{35}^{81}\textrm{Br}$ isotope = 49.31 %

Fractional abundance of $_{35}^{81}\textrm{Br}$ isotope = 0.4931

Putting values in equation 1, we get:

$\text{Average atomic mass of Bromine}=[(78.9183\times 0.5069)+(80.9163\times 0.4931)]$

$\text{Average atomic mass of Bromine}=80.4104amu$

Hence, the average atomic mass of element bromine is 80.4104 amu.

5 0

3 years ago

Most non-metals are (check all that apply) solids liquids gases

rjkz [21]

Answer:

Non-Metals can be all three.

3 0

3 years ago

Which of these properties contribute to homeostasis? Click on the correct

frez [133]

Body temperature is the main one. blood ph is very important. and reflex reactions. if this was right please give me brainliest

7 0

3 years ago

Read 2 more answers

Chlorine gas can be prepared in the laboratory by the reaction of hydrochloric acid with manganese(IV) oxide. 4 HCl ( aq ) + MnO

Leno4ka [110]

Answer:

1. HCl is the limiting reactant.

2. The theoretical yield of Cl2 is 23.197g

3. The Actual yield 19.787g

Explanation:

4HCl + MnO2 —> MnCl2 + 2H2O + Cl2

First let us calculate the number of mole of HCl and MnO2.

Molar Mass of HCl = 1 + 35.5 = 36.5g/mol

Mass of HCl = 47.7g

Number of mole = Mass /Molar Mass

Number of mole of HCl = 47.7/36.5 = 1.31mole

Molar Mass of MnO2 = 35 + (2x16) = 35 + 32 = 67g/mol

Mass of MnO2 = 40.5g

Number of mole = Mass /Molar Mass

Number of mole of MnO2 = 40.5/67 = 0.60mole

From equation,

4moles of HCl required 1mole of MnO2. Now let us consider the following:

4moles HCl require 1mole MnO2. Therefore 0.31mol of HCl will require = 0.31/4 = 0.0775mole of MnO2. This amount is little compared to the amount of MnO2 ( i.e 0.60mol) calculated. Therefore, HCl is the limiting reactant.

2. 4HCl + MnO2 —> MnCl2 + 2H2O + Cl2

Molar Mass of HCl = 36.5g/mol

Mass of HCl from the balanced equation = 4 x 36.5 = 146g

Molar Mass of Cl2 = 2 x 35.5 = 71g/mol

From the equation,

146g of HCl produced 71g of Cl2.

Therefore, 47.7g of HCl will produce = (47.7x 71)/146 = 23.197g of Cl2.

The theoretical yield of Cl2 is 23.197g

3. %yield = 85.3%

Theoretical yield = 23.197g

Actual yield =?

%yield = Actual yield /Theoretical yield

Actual yield = %yield x theoretical yield

Actual yield = 85.3% x 23.197g = (85.3/100) x 23.197 = 19.787g

5 0

3 years ago

How many grams are in 1.0 moles of baking soda?

kiruha [24]

The answer is 84.00661 grams

4 0

3 years ago