In the given compound, the percentage by mass of nitrogen and oxygen are to be determined. Concept Introduction: Mass percent composition of an element is the ratio of its percentage to the total mass of the sample. The percentage by mass of an element in the sample is expressed as follows: Percentage by mass of element = Mass of element A Mass of whole sample ×100% There are three rules on determining how many significant figures are in a number: None-zero digits are always significant. Zeros to the left of first non-zero digit, called leading zeros, are never counted as significant. Any zeros between two significant digits are significant. A final zero or trailing zeros are counted as significant only if the number has a decimal point, not otherwise. For addition and subtraction, the answer should have the same number of decimal places as the quantity with the fewest number of decimal places. For multiplication and division, the number of significant figures in the answer should be equal to the number of significant figures in the least precise measurement (i.e. number with the fewest significant figures).

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Chapter 3, Problem 76RQ

Interpretation Introduction

Interpretation:

In the given compound, the percentage by mass of nitrogen and oxygen are to be determined.

Concept Introduction:

Mass percent composition of an element is the ratio of its percentage to the total mass of the sample.

The percentage by mass of an element in the sample is expressed as follows:

Percentage by mass of element= Mass of element A Mass of whole sample ×100%

There are three rules on determining how many significant figures are in a number:

None-zero digits are always significant.

Zeros to the left of first non-zero digit, called leading zeros, are never counted as significant.

Any zeros between two significant digits are significant.

A final zero or trailing zeros are counted as significant only if the number has a decimal point, not otherwise.

For addition and subtraction, the answer should have the same number of decimal places as the quantity with the fewest number of decimal places.

For multiplication and division, the number of significant figures in the answer should be equal to the number of significant figures in the least precise measurement (i.e. number with the fewest significant figures).

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