Sometimes an Experiment Requires a Certain Pure Gas to Be

question 36

Multiple Choice

Sometimes an experiment requires a certain pure gas to be used at reduced pressure. One way to achieve this is to purchase a sealed glass container filled with the gas, and to introduce the gas into a vacuum by attaching the glass container to the vacuum chamber and breaking the tip of the glass container using a metallic bean and a magnet. If the volume of the glass container is 1.0 L and it is at a pressure of 1.0 × 10⁵ Pa and if the vacuum chamber has a volume of 2.0 L, what will the pressure be after the gas, which is to be assumed to be an ideal gas, is released into the vacuum chamber and the temperature has returned to its original value? (Note that the glass container remains part of the system.)

• A) 33 kPa
• B) 50 kPa
• C) 300 kPa
• D) 200 kPa

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Definitions:

Machine-Hours

A measure of the amount of time a machine is operated, used in calculating manufacturing overhead rates.

Predetermined Overhead Rate

A rate used to allocate estimated overhead costs to products or job orders, based on a pre-established criterion.

Machine-Hours

A metric that evaluates output or operational activity by tracking the number of hours that machinery runs.

Direct Labor-Hours

Hours worked by employees directly involved in the production process, these hours are used for calculating the cost of manufacture per product.