Molar gas molecules are made up of one mole of 6.022 × 1023 diatomic oxygen and has a mass of 31.9988 g. One mole of hydrogen contains the same exact number of diatomic hydrogen molecules but has a mass of only 2.015 88 g. The properties of gas are: easy to compress, they expand to fill containers, and they occupy more space than liquids. The relevance of gas is that it is the second largest source of electricity in the world and is growing quickly around the world as most countries substitute it for coal. From the climate perspective, this transition is better as gas emits less carbon dioxide per unit of energy.

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