It is a poly atomic anion because it has more than one atom and a negative charge
Answer:

Explanation:
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In this case, according to the given data of volume, pressure and temperature, it is possible to infer this problem can be solved via the combined gas law:

Thus, regarding the question, we evidence we need V2, but first we make sure the temperatures are in Kelvins:

Then, we obtain:

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An independent variable is the variable you are changing in order to measure the dependent variable, which is what you are measuring.
In this example, the
independent variable: chemicals in solution
dependent variable: temperature of solution