Skip to main content
Ch.5 - Thermochemistry
Brown - Chemistry: The Central Science 15th Edition
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBrown 15th EditionCh.5 - ThermochemistryProblema 92b
Capitolo 5, Problema 92b

(b) A particular chip snack food is composed of 12% protein, 14% fat, and the rest carbohydrate. What percentage of the calorie content of this food is fat?

Guida verificata passo dopo passo
1
Step 1: Understand the problem. We need to find the percentage of the calorie content that comes from fat in the snack food.
Step 2: Recall the caloric values for macronutrients. Protein and carbohydrates each provide 4 calories per gram, while fat provides 9 calories per gram.
Step 3: Assume a certain total mass of the snack food for simplicity, such as 100 grams. This makes it easy to calculate the mass of each macronutrient: 12 grams of protein, 14 grams of fat, and 74 grams of carbohydrates.
Step 4: Calculate the total calories from each macronutrient. Multiply the mass of each macronutrient by its respective caloric value: protein (12g x 4 cal/g), fat (14g x 9 cal/g), and carbohydrates (74g x 4 cal/g).
Step 5: Determine the percentage of calories from fat. Divide the calories from fat by the total calories from all macronutrients, then multiply by 100 to get the percentage.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
5m

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Caloric Content of Macronutrients

Different macronutrients provide varying amounts of calories per gram: proteins and carbohydrates each provide 4 calories per gram, while fats provide 9 calories per gram. Understanding these values is essential for calculating the contribution of each macronutrient to the total caloric content of a food item.
Video consigliato:
Percorso guidato
06:35
Effective Nuclear Charge Calculation with Slater's Rules

Percentage Composition

The percentage composition of a food item indicates the proportion of each macronutrient relative to the total mass. In this case, knowing that the snack is 12% protein, 14% fat, and the remainder carbohydrates allows us to determine the total percentage of calories derived from fat in relation to the overall caloric content.
Video consigliato:
Percorso guidato
04:19
Matter Composition

Total Caloric Calculation

To find the percentage of calorie content from fat, one must first calculate the total calories from each macronutrient based on their percentages and caloric values. Then, the calories from fat can be divided by the total calories to find the percentage contribution of fat to the overall caloric content of the snack.
Video consigliato:
Percorso guidato
01:23
Total Entropy Example
Pratica correlata
Domanda del libro di testo

Consider the reaction 2 H2(g) + O2(g) → 2 H2O(l). (a) Use the bond enthalpies in Table 5.4 to estimate H for this reaction, ignoring the fact that water is in the liquid state.

500
views
Domanda del libro di testo

The heat of combustion of fructose, C6H12O6, is -2812 kJ/mol. If a fresh golden delicious apple weighing 4.23 oz (120 g) contains 16.0 g of fructose, what caloric content does the fructose contribute to the apple?

2
views
Domanda del libro di testo

(a) A serving of a particular ready-to-serve chicken noodle soup contains 2.5 g fat, 14 g carbohydrate, and 7 g protein. Estimate the number of Calories in a serving.

3
views