How Many Chromium Atoms Are in 78

question 12

Multiple Choice

How many chromium atoms are in 78.8 g or K₂Cr₂O₇?

• A)2.24 × 10²⁴ atoms
• B)1.12 × 10²⁴ atoms
• C)3.23 × 10²³ atoms
• D)1.61 × 10²³ atoms
• E)2.25 × 10²² atoms

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Definitions:

Negative Intrapleural Pressure

The sub-atmospheric pressure within the pleural cavity that helps keep the lungs inflated by maintaining a vacuum.

Intrapulmonic Pressure

The pressure within the lung alveoli, important in the process of breathing as it affects the intake and release of air.

Ankle-Brachial Index (ABI)

A calculated number that indicates the amount of arterial blood flow to the extremity.

Systolic Pressure

The pressure of the blood against the arterial walls when the ventricles of the heart contract.