Ch.1 - Introduction: Matter, Energy, and Measurement

Brown - Chemistry: The Central Science 15th Edition

Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970당신이 사용하는 게 아니라요?교과서 변경

Brown 15th Edition

Ch.1 - Introduction: Matter, Energy, and Measurement

문제 71

1장, 문제 71

A sample of ascorbic acid (vitamin C) is synthesized in the laboratory. It contains 1.50 g of carbon and 2.00 g of oxygen. Another sample of ascorbic acid isolated from citrus fruits contains 6.35 g of carbon. According to the law of constant composition, how many grams of oxygen does it contain?

검증된 단계별 안내

Determine the mass ratio of carbon to oxygen in the synthesized sample. This is done by dividing the mass of carbon by the mass of oxygen.

Using the mass ratio from step 1, calculate the expected mass of oxygen in the natural sample. Multiply the mass of carbon in the natural sample by the mass ratio.

Verify the calculation by ensuring the units are consistent and that the ratio used matches the ratio calculated from the synthesized sample.

Consider the law of constant composition, which states that a chemical compound always contains its component elements in fixed ratio (by mass) and this ratio should be constant for any sample of that compound.

Apply the calculated mass of oxygen to the natural sample, confirming that it adheres to the law of constant composition.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Law of Constant Composition

The Law of Constant Composition states that a chemical compound always contains its component elements in fixed ratio by mass, regardless of the sample size or source. This means that the proportion of each element in a compound remains constant, allowing for the determination of the composition of unknown samples based on known ratios.

Molar Mass and Stoichiometry

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole. In stoichiometry, the relationships between the quantities of reactants and products in a chemical reaction are analyzed. Understanding molar mass allows for the conversion between grams and moles, which is essential for calculating the amounts of elements in compounds.

Empirical Formula

The empirical formula of a compound represents the simplest whole-number ratio of the elements present in that compound. By determining the mass of each element in a sample, one can calculate the empirical formula, which is crucial for understanding the composition of compounds like ascorbic acid and for comparing different samples.

관련 실천

교과서 질문

What type of quantity (for example, length, volume, density) do the following units indicate? a. mL

views

교과서 질문

Two students determine the percentage of iron in a sample as a laboratory exercise. The true percentage is 34.43%. The students’ results for three determinations are as follows: 1. 34.44, 34.41, 34.46 2. 34.51, 34.56, 34.48 b. Precision can be judged by examining the average of the deviations from the average value for that data set. (Calculate the average value for each data set; then calculate the average value of the absolute deviations of each measurement from the average.) Which set is more precise?

views

교과서 질문

What type of quantity (for example, length, volume, density) do the following units indicate? f. nm

views

교과서 질문

(b) A(n) _________ reliably predicts the behavior of matter, while a(n) _________ provides an explanation for that behavior.

606

views

교과서 질문

Classify each of the following as a pure substance, a solution, or a heterogeneous mixture: c. a wood plank

views

교과서 질문

(a) Which is more likely to eventually be shown to be incorrect: an hypothesis or a theory?

448

views