What has the greatest effect on changes in phases of matter

Solid is the state in which matter maintains a fixed volume and shape; liquid is the state in which matter adapts to the shape of its container but varies only slightly in volume; and gas is the state in which matter expands to occupy the volume and shape of its container.

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Explanation:

2.5 moles of H2

Explanation:

First, let us write a balanced equation for the reaction of Hydrogen to produce water. This is shown below:

2H2 + O2 —> 2H2O

From the equation above,

2 moles of H2 produced 2 moles of H2O.

Therefore, 2.5 moles of H2 will produce 2.5 moles of H2O