**Answer:**

C. Different heights of holes in the container

**Explanation:**

The independent variable is the variable that changes. So the independent variable is C because the heights of the holes change.

**Answer:**

By the time the Vesuvius eruption sputtered to an end the next day, Pompeii was buried under millions of tons of volcanic ash. About 2,000 Pompeiians were dead, but the eruption killed as many as 16,000 people overall. By

the time the Vesuvius eruption sputtered to an end the next day, Pompeii was buried under millions of tons of volcanic ash. About 2,000 Pompeiians were dead, but the eruption killed as many as 16,000 people overall.

**Explanation:**

Answer: 9 moles of O2 and produce 6 moles of Fe2O3

Explanation:Please see attachment for explanation

**Answer:**

**Explanation:**

We want to find the new volume given the temperature, so we use Charles's Law. This states the volume of a gas is directly proportional to the temperature. The formula is:

We know the original volume is 20.0 liters and the temperature is 23.0 degrees Celsius. The temperature changes to 45.0 degrees Celsius, but we don't know the new volume. Substitute the known values into the formula.

We are solving the new volume, so we need to isolate the variable V₂. It is being divided by 45.0 degrees Celsius. The inverse of division is multiplication, so we multiply both sides by 45.0 °C.

The units of degrees Celsius cancel.

If we round to the nearest hundredth, the 0 in the thousandth place tells us to leave the 3.

The new volume of the balloon is approximately <u>**39.13 Liters.**</u>