Chemistry for Today: General, Organic, and Biochemistry
Chemistry for Today: General, Organic, and Biochemistry
9th Edition
ISBN: 9781305960060
Author: Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen
Publisher: Cengage Learning
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Chapter 2, Problem 2.30E
Interpretation Introduction

(a)

Interpretation:

The molecular weight of the given molecule in u is to be stated.

Concept introduction:

The total number of protons and neutron which are present in an atom is collectively known as atomic mass of that atom. The total number of protons present in the nucleus of an atom is known as atomic number of that atom.

Expert Solution
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Answer to Problem 2.30E

The molecular weight of the given molecule, nitrogen dioxide in u is 46.01u.

Explanation of Solution

The given molecule is nitrogen dioxide, NO2. This molecule contains one nitrogen atom and two oxygen atoms.

According to the periodic table, the atomic weight of one nitrogen atom is 14.01u and atomic weight of one oxygen atom is 16.00u. Thus, the molecular weight of nitrogen dioxide molecule is calculated as,

MolecularweightofNO2=(atomicweightofN)+(2×atomicweightofO)

Substitute the value of atomic weight of one nitrogen atom and oxygen atom in the above expression.

MolecularweightofNO2=(14.01u)+(2×16.00u)=46.01u

Thus, the molecular weight of the given molecule, nitrogen dioxide in u is 46.01u.

Conclusion

The molecular weight of the given molecule, nitrogen dioxide in u is 46.01u.

Interpretation Introduction

(b)

Interpretation:

The molecular weight of the given molecule in u is to be stated.

Concept introduction:

The total number of protons and neutron which are present in an atom is collectively known as atomic mass of that atom. The total number of protons present in the nucleus of an atom is known as atomic number of that atom.

Expert Solution
Check Mark

Answer to Problem 2.30E

The molecular weight of the given molecule, ammonia in u is 17.034u.

Explanation of Solution

The given molecule is ammonia, NH3. This molecule of ammonia contains one nitrogen atom and three hydrogen atoms.

According to the periodic table, the atomic weight of one nitrogen atom is 14.01u and the atomic weight of one hydrogen atom is 1.008u. Thus, the molecular weight ammonia molecule is calculated as,

MolecularweightofNH3=(atomicweightofN)+(3×atomicweightofH)

Substitute the value of atomic weights of nitrogen and hydrogen atoms in the above expression.

MolecularweightofNH3=(14.01u)+(3×1.008u)=17.034u

Thus, the molecular weight of the given molecule, ammonia in u is 17.034u.

Conclusion

The molecular weight of the given molecule, ammonia in u is 17.034u.

Interpretation Introduction

(c)

Interpretation:

The molecular weight of the given molecule in u is to be stated.

Concept introduction:

The total number of protons and neutron which are present in an atom is collectively known as atomic mass of that atom. The total number of protons present in the nucleus of an atom is known as atomic number of that atom.

Expert Solution
Check Mark

Answer to Problem 2.30E

The molecular weight of the given molecule, glucose in u is 180.156u.

Explanation of Solution

The given molecule is glucose, C6H12O6. This molecule of glucose contains six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.

According to the periodic table, the atomic weight of one hydrogen atom is 1.008u, the atomic weight of one oxygen atom is 16.00u and the atomic weight of one carbon atom is 12.01u. Thus, the molecular weight of glucose molecule is calculated as,

MolecularweightofC6H12O6=[(6×atomicweightofC)+(12×atomicweightofH)+(6×atomicweightofO)]

Substitute the value of atomic weights of hydrogen, oxygen and carbon atoms in the above expression.

MolecularweightofC6H12O6=[(6×12.01u)+(12×1.008u)+(6×16.00u)]=180.156u

Thus, the molecular weight of the given molecule, glucose in u is 180.156u.

Conclusion

The molecular weight of the given molecule, glucose in u is 180.156u.

Interpretation Introduction

(d)

Interpretation:

The molecular weight of the given molecule in u is to be stated.

Concept introduction:

The total number of protons and neutron which are present in an atom is collectively known as atomic mass of that atom. The total number of protons present in the nucleus of an atom is known as atomic number of that atom.

Expert Solution
Check Mark

Answer to Problem 2.30E

The molecular weight of the given molecule, ozone in u is 48.00u.

Explanation of Solution

The given molecule is ozone, O3. It is a triatomic molecule and possesses three atoms of oxygen.

According to the periodic table, the atomic weight of one oxygen atom is 16.00u. Thus, the molecular weight of ozone molecule is calculated as,

MolecularweightofO3=3×(atomicweightofO)

Substitute the value of atomic weight of one oxygen atom in the above expression.

MolecularweightofO3=3×(16.00u)=48.00u

Thus, the molecular weight of the given molecule, ozone in u is 48.00u.

Conclusion

The molecular weight of the given molecule, ozone in u is 48.00u.

Interpretation Introduction

(e)

Interpretation:

The molecular weight of the given molecule in u is to be stated.

Concept introduction:

The total number of protons and neutron which are present in an atom is collectively known as atomic mass of that atom. The total number of protons present in the nucleus of an atom is known as atomic number of that atom.

Expert Solution
Check Mark

Answer to Problem 2.30E

The molecular weight of the given molecule, ethylene glycol in u is 62.068u.

Explanation of Solution

The given molecule is ethylene glycol, C2H6O2. This molecule of ethyl alcohol contains two carbon atoms, six hydrogen atoms and two oxygen atoms.

According to the periodic table, the atomic weight of one hydrogen atom is 1.008u, the atomic weight of one oxygen atom is 16.00u and the atomic weight of one carbon atom is 12.01u. Thus, the molecular weight of ethylene glycol molecule is calculated as,

MolecularweightofC2H6O2=[(2×atomicweightofC)+(6×atomicweightofH)+(2×atomicweightofO)]

Substitute the value of atomic weights of hydrogen, oxygen and carbon atoms in the above expression.

MolecularweightofC2H6O2=[2×(12.01u)+6×(1.008u)+2×(16.00u)]=62.068u

Thus, the molecular weight of the given molecule, ethylene glycol in u is 62.068u.

Conclusion

The molecular weight of the given molecule, ethylene glycol in u is 62.068u.

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Chapter 2 Solutions

Chemistry for Today: General, Organic, and Biochemistry

Ch. 2 - Determine the number of electrons that would have...Ch. 2 - Determine the number of electrons that would have...Ch. 2 - Determine the number of electrons and protons...Ch. 2 - Determine the number of electrons and protons...Ch. 2 - Prob. 2.15ECh. 2 - Prob. 2.16ECh. 2 - Write symbols like those given in Exercises 2.15...Ch. 2 - Write symbols like those given in Exercises 2.15...Ch. 2 - Prob. 2.19ECh. 2 - Prob. 2.20ECh. 2 - Write isotope symbols for neutral atoms with the...Ch. 2 - Write isotope symbols for neutral atoms with the...Ch. 2 - Write the symbols and names for two elements whose...Ch. 2 - Round atomic weights to the nearest whole number,...Ch. 2 - Round atomic weights to the nearest whole number,...Ch. 2 - What are the symbol and name for an element whose...Ch. 2 - In the first 36 elements, 6 elements have atoms...Ch. 2 - What are the symbol and name of the element whose...Ch. 2 - Prob. 2.29ECh. 2 - Prob. 2.30ECh. 2 - The molecular weight was determined for a gas that...Ch. 2 - A flammable gas is known to contain only carbon...Ch. 2 - Glycine, an amino acid found in proteins, has a...Ch. 2 - Serine, an amino acid found in proteins, has a...Ch. 2 - Naturally occurring sodium has a single isotope....Ch. 2 - Naturally occurring aluminum has a single isotope....Ch. 2 - Calculate the atomic weight of lithium on the...Ch. 2 - Calculate the atomic weight of boron on the basis...Ch. 2 - Calculate the atomic weight of silicon on the...Ch. 2 - Calculate the atomic weight of copper on the basis...Ch. 2 - Refer to the periodic table and determine how many...Ch. 2 - Refer to the periodic table and determine how many...Ch. 2 - Write three relationships equalities based on the...Ch. 2 - Write three relationships equalities based on the...Ch. 2 - Use a factor derived from the relationships...Ch. 2 - Use a factor derived from the relationships...Ch. 2 - Prob. 2.47ECh. 2 - Refer to the periodic table and calculate the...Ch. 2 - Prob. 2.49ECh. 2 - Prob. 2.50ECh. 2 - Answer the following questions based on the...Ch. 2 - Answer the following questions based on...Ch. 2 - How many moles of N2O5 contain the same number of...Ch. 2 - How many grams of C2H6O contain the same number of...Ch. 2 - Prob. 2.55ECh. 2 - Determine the mass percentage of hydrogen in CH4...Ch. 2 - Prob. 2.57ECh. 2 - Prob. 2.58ECh. 2 - Urea (CH4N2O) and ammonium sulfate (N2H8SO4) are...Ch. 2 - Prob. 2.60ECh. 2 - Prob. 2.61ECh. 2 - Prob. 2.62ECh. 2 - Prob. 2.63ECh. 2 - The mass of a single carbon 12 atom is 1.991023g....Ch. 2 - Prob. 2.65ECh. 2 - Prob. 2.66ECh. 2 - a. Explain how atoms of different elements differ...Ch. 2 - The atomic weight of aluminum is 26.98u and the...Ch. 2 - Answer the question in the caption of Figure 2.3...Ch. 2 - Answer the question in the caption of Figure 2.5...Ch. 2 - Prob. 2.71ECh. 2 - Prob. 2.72ECh. 2 - Prob. 2.73ECh. 2 - Prob. 2.74ECh. 2 - Prob. 2.75ECh. 2 - Which one of the following substances is a...Ch. 2 - Which of the following is true about compounds?...Ch. 2 - C1734l has a.17 protons, 17 electrons, and 17...Ch. 2 - If two atoms are isotopes, they will a.have same...Ch. 2 - Copper (Cu) has an atomic number of 29 and a mass...Ch. 2 - Atoms are electrically neutral. This means that an...Ch. 2 - The negative charged particle found within the...Ch. 2 - Prob. 2.83ECh. 2 - Prob. 2.84ECh. 2 - The mass of an atom is almost entirely contributed...Ch. 2 - Which of the following is the chemical symbol for...Ch. 2 - Prob. 2.87ECh. 2 - What is the mass number of an atom with 60...Ch. 2 - Which of the following represents Avogadros...Ch. 2 - Which of the following has the greatest number of...Ch. 2 - The formula of carbon dioxide is CO2. Its...Ch. 2 - What is the molar mass of calcium oxide, CaO? a....Ch. 2 - How many grams are contained in 0.200mol of...Ch. 2 - How many moles are contained in a 54.0g sample of...
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