Calculate the density of a sample of carbon monoxide (CO) at STP. Round for 3 significant figures.

So what you would do is go through and add 3 teaspoons(tsp) 6 times because of the 6 tablespoons(tbsp). which will give you an answer of 18. another way is to multiply 3x6=18.

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.