A Substance Is Found to Consist of 1

question 30

Multiple Choice

A substance is found to consist of 1.900g of silver,0.250g of nitrogen,and 0.850g of oxygen.What is the percent by mass of oxygen in the compound?

• A)28.3%
• B)8.33%
• C)63.3%
• D)85.0%

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Definitions:

Epicranius

A muscle of the scalp that raises the eyebrows and wrinkles the forehead horizontally.

Platysma

A superficial muscle in the neck that plays a role in facial expression.

Risorius

A muscle of facial expression, drawing the corner of the mouth laterally, thus creating expressions like grinning.

Lateral Pterygoid

A muscle of the jaw involved in opening the mouth and moving the jaw from side to side.