Concept explainers
4-42 Calculate the formula weight of:
(a) KCl
(b) Na3PO4
(c) Fe(OH)2
(d) NaAl(SO3)2
(e) AL2(SO4)3
(f) (NH4)2CO3
(a)
Interpretation:
To calculate the formula weight for
Concept Introduction:
Formula mass is the sum of masses of the atoms present in a molecule. These compounds are those that do not generally occur as a single molecule. For e.g.
When we calculate the sum of masses of the elements present in a compound in 1 mole, we calculate it for the Avogadro number, molar mass comes out in grams.
For,
The formula mass is calculated as sum of 1 Sodium atom and 1 mole of Chlorine atoms.
Answer to Problem 4.42P
The formula weight of
= 74.5 amu.
Explanation of Solution
Formula mass is the sum of masses of the atoms present in a molecule. These compounds are those that do not generally occur as a single molecule. For e.g.
The formula mass is calculated as sum of 1 Potassium atom and 1 Chlorine atom.
(b)
Interpretation:
To calculate the formula weights for
Concept Introduction:
Formula mass is the sum of masses of the atoms present in a molecule. These compounds are those that do not generally occur as a single molecule. For e.g.
When we calculate the sum of masses of the elements present in a compound in 1 mole, we calculate it for the Avogadro number, molar mass comes out in grams.
For e.g. -
The formula mass is calculated as sum of 1 Sodium atom and 1 mole of Chlorine atoms.
Answer to Problem 4.42P
The formula weight of
= 163 amu.
Explanation of Solution
Formula mass is the sum of masses of the atoms present in a molecule. These compounds are those that do not generally occur as a single molecule. For e.g.
The formula mass is calculated as sum of 3 Sodium atom and 1 Phosphorous atom and 4 oxygen atom.
(c)
Interpretation:
To calculate the formula weights for
Concept Introduction:
Formula mass is the sum of masses of the atoms present in a molecule. These compounds are those that do not generally occur as a single molecule. For e.g.
When we calculate the sum of masses of the elements present in a compound in 1 mole, we calculate it for the Avogadro number, molar mass comes out in grams.
For e.g. -
The formula mass is calculated as sum of 1 Iron atom, 2 oxygen atoms and 2 Hydrogen atoms.
Answer to Problem 4.42P
The formula weight of
= 90amu.
Explanation of Solution
Formula mass is the sum of masses of the atoms present in a molecule. These compounds are those that do not generally occur as a single molecule. For e.g.
The formula mass is calculated as sum of 1 Iron atom, 2 oxygen atoms and 2 Hydrogen atoms.
(d)
Interpretation:
To calculate the formula weights for
Concept Introduction:
Formula mass is the sum of masses of the atoms present in a molecule. These compounds are those that do not generally occur as a single molecule. For e.g.
When we calculate the sum of masses of the elements present in a compound in 1 mole, we calculate it for the Avogadro number, molar mass comes out in grams.
For e.g. -
The formula mass is calculated as sum of 1 Sodium atom and 1 mole of Chlorine atoms.
Answer to Problem 4.42P
The formula weight of
= 210 amu.
Explanation of Solution
Formula mass is the sum of masses of the atoms present in a molecule. These compounds are those that do not generally occur as a single molecule. For e.g.
The formula mass is calculated as sum of 1 Sodium atom, 1 Aluminium atom ,6 oxygen atoms and 2 Sulphur atoms.
(e)
Interpretation:
To calculate the formula weights for
Concept Introduction:
Formula mass is the sum of masses of the atoms present in a molecule. These compounds are those that do not generally occur as a single molecule. For e.g.
When we calculate the sum of masses of the elements present in a compound in 1 mole, we calculate it for the Avogadro number, molar mass comes out in grams.
For e.g. -
The formula mass is calculated as sum of 1 Sodium atom and 1 mole of Chlorine atoms.
Answer to Problem 4.42P
The formula weight of
=342amu.
Explanation of Solution
Formula mass is the sum of masses of the atoms present in a molecule. These compounds are those that do not generally occur as a single molecule. For e.g.
The formula mass is calculated as sum of 2 Aluminium atom, 12 oxygen atoms and 3Sulfur atoms.
(f)
Interpretation:
To calculate the formula weights for
Concept Introduction:
Formula mass is the sum of masses of the atoms present in a molecule. These compounds are those that do not generally occur as a single molecule. For e.g.
When we calculate the sum of masses of the elements present in a compound in 1 mole, we calculate it for the Avogadro number, molar mass comes out in grams.
For e.g. -
The formula mass is calculated as sum of 1 Sodium atom and 1 mole of Chlorine atoms.
Answer to Problem 4.42P
The formula weight of
= 96amu.
Explanation of Solution
Formula mass is the sum of masses of the atoms present in a molecule. These compounds are those that do not generally occur as a single molecule. For e.g.
The formula mass is calculated as sum of 2Nitrogen atom, 8Hydrogen atom, 3 oxygen atoms and 1 Carbon atom.
Want to see more full solutions like this?
Chapter 4 Solutions
Introduction to General, Organic and Biochemistry
- 4-53 A typical deposit of cholesterol, C27H46O, in an artery might have a mass of 3.9 mg. How many mol ecules of cholesterol are in this mass?arrow_forward4-58 At one time, acetaldehyde was prepared industrially by the reaction of ethylene with air in the presence of a copper catalyst. How many grams of acetalde hyde can be prepared from 81.7 g of ethylene?arrow_forward4-88 Chlorophyll, the compound responsible for the green color of leaves and grasses, contains one atom of magnesium in each molecule. If the percentage by weight of magnesium in chlorophyll is 2.72%, what is the molecular weight of chlorophyll?arrow_forward
- 4-45 Calculate the number of moles in: (a) 32 g of methane, CH4 (b) 345.6 g of nitric oxide, NO (c) 184.4 g of chlorine dioxide, ClO2 (d) 720. g of glycerin, C3H8O3arrow_forward4-47 Calculate the number of moles of: (a) O atoms in 18.1 mol of forma1dehyde, CH2O (b) Br atoms in 0.41 mol of bromoform, CHBr3 (c) O atoms in 3.5 X 103 mol of A12(SO4)3 (d)Hg atoms in 87 g of HgOarrow_forward4-56 Magnesium reacts with sulfuric acid according to the following equation. How many moles of lI2 are produced by the complete reaction of 230. mg of Mg with sulfuric acid?arrow_forward
- 4-61 In photosynthesis, green plants convert CO2 and H2O to glucose, C6H12O6. How many grams of CO2are required to produce 5.1 g of glucose?arrow_forward4-52 The molecular weight of hemoglobin is about 68,000 amu. What is the mass in grams of a single molecule of hemoglobin?arrow_forward4-20 Calcium oxide is prepared by heating limestone (calcium carbonate, CaCO3) to a high temperature, at which point it decomposes to calcium oxide and carbon dioxide. Write a balanced equation for this preparation of calcium oxide.arrow_forward
- 4-51 What is the mass in grams of each number of mol ecules of formaldehyde, CH2O? (a) 100. molecules (b) 3000. molecules (c) 5.0 106 molecules (d) 2.0 1024 moleculesarrow_forward4-59 Chlorine dioxide, ClO2, is used for bleaching paper. It is also the gas used to kill the anthrax spores that contaminated the Hart Senate Office Building in the fall of 2001. Chlorine dioxide is prepared by treating sodium chlorite with chlorine gas. (a) Balance the equation for the preparation of chlorine dioxide. (b) Calculate the weight of chlorine dioxide that can be prepared from 5.50 kg of sodium chlorite.arrow_forward4-57 Chloroform, CHCl3, is prepared industrially by the reaction of methane with chlorine. How many grams of Cl2 are needed to produce 1.50 moles of chloroform?arrow_forward
- Introduction to General, Organic and BiochemistryChemistryISBN:9781285869759Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar TorresPublisher:Cengage LearningChemistry for Engineering StudentsChemistryISBN:9781337398909Author:Lawrence S. Brown, Tom HolmePublisher:Cengage Learning