Table of contents

1. Matter and Measurements4h 29m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 35m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines38m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 46m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

6. Chemical Reactions & Quantities

Mole Concept

GOB Chemistry

6. Chemical Reactions & Quantities

Mole Concept

3:55 minutes

Problem 70McMurry - 8th Edition

Textbook Question

Calcium citrate, Ca(C6H5O7)2(MW = 498.5 amu), is a common dietary supplement to provide calcium needed for strong teeth and bones. What mass of calcium citrate would be needed to provide the recommended daily intake of calcium?

Verified step by step guidance

Identify the recommended daily intake of calcium in milligrams or grams.

Determine the percentage of calcium in calcium citrate, Ca(C6H5O7)2.

Calculate the molar mass of calcium in the compound. Calcium has an atomic mass of approximately 40.08 amu.

Use the percentage of calcium in calcium citrate to find out how much calcium citrate is needed to meet the recommended daily intake of calcium.

Set up a proportion or equation to solve for the mass of calcium citrate required, using the percentage of calcium and the recommended daily intake.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Molar Mass Calculation

Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol). For calcium citrate, the molar mass is calculated by summing the atomic masses of all atoms in its formula, Ca(C6H5O7)2. This value is essential for converting between grams of the compound and moles, which is necessary for determining how much calcium citrate is needed to meet dietary requirements.

Calcium Content in Calcium Citrate

Calcium citrate contains a specific percentage of elemental calcium by mass. To determine how much calcium citrate is required to meet the recommended daily intake of calcium, one must first know the calcium content in the compound. This involves calculating the mass of calcium in a given mass of calcium citrate, which is crucial for ensuring adequate calcium intake.

Recommended Daily Intake of Calcium

The recommended daily intake of calcium varies by age, sex, and life stage, typically ranging from 1,000 to 1,300 mg for adults. Understanding these guidelines is vital for determining how much calcium citrate is necessary to achieve the desired calcium intake. This ensures that individuals can maintain bone health and prevent deficiencies through proper supplementation.

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