How many grams of Na2CO3 are required to make 0.100 moles of Na2CO3? @Kainui

Question

kainui · Answer

Ok, so how far can you get on your own?

anonymous · Answer

I can solve it if you could explain me

kainui · Answer

Definitely! Alright so on the periodic table next to every element there are two numbers. So if you look at Na (Sodium) it has 11 and 22.990, can you tell me what these numbers mean?

anonymous · Answer

so uh known 
 Atomic number: 11
Atomic weight: 22.990
or is there another way?

kainui · Answer

No good! This is correct! I'm just making sure you understand what these numbers actually mean though.

The atomic number is the number of protons an atom has. This isn't very important to us for this question, but it is important.

The atomic weight is what we are interested in. It tells you that if you have 1 mole of this element, then this is how many grams it weighs.

So for Sodium (Na) we see that we have 22.990 grams per every mole of Na. Or mathematically we can write it as: $$\Large 22.990 \frac{ grams }{mol}$$

Ok, now knowing this, can you find out how many grams per mole Na2CO3 is? Just add up all the weights of the parts together. Also, notice that it has 2 sodium, so you would need to multiply the amount of that by 2.

Show me your best attempt, don't worry about being wrong, I'll help you.