Using an chemistry equation, with the little and big numbers, do you mutiply them or add?

for example.





2NaH3


(in the case the 3 after the H is a little one)


now do you mutiply the 2 and the 3.


or do you add them to find out how many hydrogens there are?Using an chemistry equation, with the little and big numbers, do you mutiply them or add?
6, you multiply the 2 beacuse there are two atoms of the substance your are using and there are three hydrogens in each.Using an chemistry equation, with the little and big numbers, do you mutiply them or add?
The general rule is that any number in front of an element is what every number after the element gets multiplied by. Numbers in front of elements are usually larger than the subscrips following them. Unfortunately, computers don't display them very well. H2O has 2 hydrogens and an Oxygen, even though the 2 is in front of the O. The 2 ought to be a subscript and it represents the number of atoms in a molecule. Larger numbers in front of molecules represent how many molecules there are. In the case where there are two numbers between elements, there is usually a seperator. For example CuSO4.5H2O has 1 Copper, 9 Oxygens, 1 Sulfur and 10 Hydrogens. The ';.'; is the seperator. Cu(NO3)2 has 1 Copper, 2 Nitrogens and 6 Hydrogens. The seperator here is ';)';.
2 NaH3 is formed of 2 atoms Na and 2*3 =6 H atoms
Think of it like an algebra formula:





2(a + 3b) = 2a + 6b





So in the case of 2NaH3, you would have 2 Na + 6 H, or a total of 8 atoms in the molecule.





Incidentally, NaH doesn't exist. 2 NH3 would be a better example to use (this is ammonia gas).
You don't worry about that at all. You first do Na x 2 then H x 3 . After getting the answers, you add them. That's your final answer.

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