Bromine has two isotopes 79Br and 81Br, whose masses (78.9183 and 80.9163 amu) and abundances (50.69% and 49.31%, respectively) were determined in earlier experiments. Calculate the average atomic mass of bromine based on these experiments.

Answers

Answer 1

Answer:

Answer:

Average atomic mass = 79.9034 amu

Explanation:

The formula for the calculation of the average atomic mass is:

$Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}* {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}* {Mass\ of\ the\ second\ isotope})$

Given that:

For first isotope:

% = 50.69 %

Mass = 78.9183 amu

For second isotope:

% = 49.31 %

Mass = 80.9163 amu

Thus,

$Average\ atomic\ mass=(50.69)/(100)* {78.9183}+(49.31)/(100)* {80.9163}\ amu$

$Average\ atomic\ mass=40.0036+39.8998\ amu$

Average atomic mass = 79.9034 amu

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The energy that is released by cellular respiration is in the form of
a. dark energy.
b. solar energy.
c.nuclear energy.
d.chemical energy.

Answers

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Its D.Chemical Energy

Which reaction occurs at the cathode in an electrochemical cell?(1) combustion (2) neutralization (3) oxidation (4) reduction

Answers

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The primary role of ATP is to _______ by transferring a phosphate group to a molecule and forming ADP.A
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B)

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C)

reduce the activation energy of a reaction

D)

take energy from cellular work

Answers

Answer:

A) provide energy for cellular work

Explanation:

The Adenosine triphosphate (ATP) molecule is the nucleotide known in biochemistry as the "molecular currency" of intracellular energy transfer; that is, ATP is able to store and transport chemical energy within cells. ATP also plays an important role in the synthesis of nucleic acids.

ATP always GIVES ENERGY

Final answer:

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Explanation:

The key role of ATP, also known as Adenosine Triphosphate, is to provide energy for cellular work. ATP carries out this function by transferring a phosphate group to a molecule. This breaks a high energy bond and forms ADP (Adenosine Diphosphate), releasing energy that can be utilized by the cell to do work.

ATP acts as the primary energy currency of the cell. This process is at the heart of cellular metabolism and is common to all living organisms. Essentially, ATP acts as a bridge, transferring energy from chemical reactions that yield energy to cellular processes that consume energy, such as muscular contraction, cell division, or the synthesis of biomolecules.

Learn more about ATP here:

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Carbon dioxide is one of the main gases in the mixture of gases coming out of the kiln.Give two reasons why.

Answers

because the kiln utilizes fire, fire uses oxygen and the fuel to create CO2
CO2 would be the main gas because the main components of the reactants are carbon and oxygen, which make up CO2

How many grams of NH3 can be produced from the reaction of 28g of N2 and 25g of H2?

Answers

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= (28g + 3*25g)/2
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How many grams of sodium chloride are present in a 0.75 M solution with a volume of 500.0 milliliters?

Answers

The units for molarity is moles of solute per liter of solution which means if you multiply the molarity of a solution by its volume you get how many moles of solute are in the solution. (0.75Mx0.5L=0.375mol NaCl) Then you can multiply the moles of sodium chloride (0.375 mol) by its molar mass (58.45 g/mol) to get 21.92g of sodium chloride. That means there is 21.92 grams of sodium chloride in 500mL of 0.75M solution. I hope this helps. Let me know if anything is unclear.

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