Uncertainty in the formula mass of potassium hydrogen phthalate has to be expressed with 95 % confidence interval. Concept introduction: Uncertainty in formula mass refers to uncertainty occurs in measuring the atomic mass for chemical calculations. In this theory it is supposed that distribution of atomic mass follows a rectangular distribution so that atomic mass tends to lie equally anywhere between the interval from x ¯ − a to x ¯ + a where ‘a’ corresponds to uncertainty in the periodic table. Rectangular distribution has standard uncertainty of a / 3 .

Question

The reaction for obtaining NO2 from NO and O2 has the rate equation: v = k[NO]2[O2]. Indicate which of the following options is correct.(A). This rate equation is inconsistent with the reaction consisting of a single trimolecular step.(B). Since the overall order is 3, the reaction must necessarily have some trimolecular step in its mechanism.(C). A two-step mechanism: 1) NO + NO ⇄ N2O2 (fast); 2) N2O2 + O2 → NO2 + NO2 (slow).(D). The mechanism must necessarily consist of three unimolecular elementary steps with very similar rate constants.

Answer 1

Question

Chapter 11, Problem 11.57P

(a)

Interpretation Introduction

Interpretation:

Uncertainty in the formula mass of potassium hydrogen phthalate has to be expressed with 95% confidence interval.

Concept introduction:

Uncertainty in formula mass refers to uncertainty occurs in measuring the atomic mass for chemical calculations. In this theory it is supposed that distribution of atomic mass follows a rectangular distribution so that atomic mass tends to lie equally anywhere between the interval from x¯−a to x¯+a where ‘a’ corresponds to uncertainty in the periodic table. Rectangular distribution has standard uncertainty of a/3.

(b)

Interpretation Introduction

Interpretation:

Standard uncertainty to be used to verify the purity of the reagent potassium hydrogen phthalate has the mentioned.

Concept introduction:

Uncertainty in formula mass refers to uncertainty occurs in measuring the atomic mass for chemical calculations. In this theory it is supposed that distribution of atomic mass follows a rectangular distribution so that atomic mass tends to lie equally anywhere between the interval from x¯−a to x¯+a where ‘a’ corresponds to uncertainty in the periodic table. Rectangular distribution has standard uncertainty of a/3.

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The reaction for obtaining NO2 from NO and O2 has the rate equation: v = k[NO]2[O2]. Indicate which of the following options is correct.(A). This rate equation is inconsistent with the reaction consisting of a single trimolecular step.(B). Since the overall order is 3, the reaction must necessarily have some trimolecular step in its mechanism.(C). A two-step mechanism: 1) NO + NO ⇄ N2O2 (fast); 2) N2O2 + O2 → NO2 + NO2 (slow).(D). The mechanism must necessarily consist of three unimolecular elementary steps with very similar rate constants.

a. What is the eluent used in the column chromatography here (a “silica plug filtration” is essentially a very short column)? b. The spectroscopy of compound 5b is described in the second half of this excerpt, including 1H-NMR and 13C-NMR (which you will learn about in CHEM 2412L), MS (which you will learn about later in CHEM 2411L) and IR. One of the IR signals is at 3530 cm-1. What functional group does this indicate might be present in compound 5b?

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