A Specially Prepared Sample of Nitrogen Contains 30% ¹⁴N (Mass

question 75

Multiple Choice

A specially prepared sample of nitrogen contains 30% ¹⁴N (mass = 14.00 u) and 70% ¹⁵N (mass = 15.00 u) . What is the atomic mass of the nitrogen in this sample?

• A) 14.00
• B) 14.30
• C) 14.50
• D) 14.70
• E) 15.00

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Definitions:

Vascular Bundles

Structures in plants that contain xylem and phloem, responsible for the transport of water, nutrients, and sugars.

Sclereids

A type of plant cell known for their thick, lignified walls, contributing to the hardness of seeds, nuts, and fruit pits.

Lateral Roots

Secondary roots that grow out from the main root, improving the plant’s stability and water absorption.

Palisade Mesophyll

The layer of vertically elongated cells found in the leaves of plants, rich in chloroplasts, where most photosynthesis occurs.