What is 12 g/mol?

"12 g/mol is like having 12 marbles that weigh the same as a dozen eggs."

Imagine you have a bag full of tiny identical balls, these are atoms. Now, if you take a dozen of them (like 12 eggs in a carton), and they all together weigh 12 grams, then each one weighs about 1 gram.

That’s what 12 g/mol means: it's the weight of one mole of something, like how many tiny balls fit into that 12-gram bag. A mole is a special number in science, kind of like a dozen but way bigger (it's about 60 billion trillion!). So instead of counting each ball one by one, scientists use moles to make things easier.

If you're baking cookies and need exactly the right amount of sugar or flour, you might count cups. Scientists do something similar with grams and moles, they use them to measure how much of a substance is in a recipe (like a chemical reaction).

So 12 g/mol helps scientists know how many tiny balls (atoms) are in that 12-gram bag, just like knowing how many eggs are in a carton.