Standard molar entropy

Okay kiddo, have you ever played with Legos? Imagine you have a toy box full of different colored Legos. Each Lego block has its own unique shape and size. Just like how each Lego block is different, each molecule in a substance is different too.

Now, let's say you take all the Lego blocks out of the toy box and start building something. As you build, you notice that some blocks fit together easier than others. Some blocks might be more wobbly or harder to snap into place. This is kind of like how molecules in a substance move and interact with each other.

The way molecules move and interact with each other can affect how much energy they have. This energy is called entropy. Think of it like the energy you have when you're running around and playing, compared to when you're sitting still and quiet.

Scientists have figured out that each substance has its own standard molar entropy. This is just a fancy way of saying "how much energy the molecules have on average". It's like an average score for all the Legos in the toy box.

The standard molar entropy is usually measured in units called joules per mole per Kelvin. But don't worry too much about that - just remember that it tells us how much energy the molecules in a substance have on average.