Question

A sample of helium gas is placed in a rigid cylinder that has a movable piston. The volume of the gas is varied by moving the piston, while the temperature is held constant at 273 K. The volumes and corresponding pressures for three trials are measured and recorded in the data table below. For each of these trials, the product of pressure and volume is also calculated and recorded. For a fourth trial, only the volume is recorded.

State evidence found in the data table that allows the product of pressure and volume for the fourth trial to be predicted.

Answer 1

Boyle's Law allows prediction of the product of pressure and volume for the fourth trial, based on the consistency of this product in previous trials at a fixed temperature.

Step-by-step explanation:

The question relates to the laws governing the behavior of gases, specifically Boyle's Law, which states that the product of the pressure and volume of a gas is constant at a fixed temperature (assuming ideal gas behavior). The evidence from the data table required to predict the product of pressure and volume for the fourth trial is the constancy of this product in the previous trials at the same temperature. Since the temperature is held constant at 273 K during the experiment, we can confidently predict that the product of pressure and volume for the fourth trial will be the same as in the previous trials, as per Boyle's Law.

Answer 2

Helium is a light gas.  Movement can be predicted by which chamber has the lighter gas(es) and which chamber has the heavier.  constant changes can also be a variable.  If the gas is constant, then changes are more easily predicted.